Top Risks

• THREAT FEED: extension ID independently confirmed malicious by TPCI chrome-mal-ids — Kokushibo Demon Slayer Gameograf [adware] + malext.io malicious_extension_sentry (+2.5, capped).
• Uninstall AND install URL hijack to gameograf.com — classic traffic-monetization shell pattern.
• NewTab override with 'search' permission — persistent search-provider manipulation surface.
• No developer name listed; verified publisher but anonymous-facing presence.
• innerHTML DOM-XSS sinks in popup.js and calendar.js with no CSP to mitigate.

Evidence

• install_url_hijack + uninstall_url_hijack manifest Both onInstalled and uninstall redirect to gameograf.com with UTM params — monetization shell fingerprint.
• newtab_override manifest chrome_url_overrides.newtab = newtab.html; replaces every new-tab page for all users.
• search_permission manifest Declared 'search' permission alongside newtab override enables search-provider manipulation.
• no_developer_name store developer_name is empty string; verified publisher but no display name raises accountability gap.
• dom_sink_innerhtml crx Two innerHTML assignments from variables found in popup.js and calendar.js; CSP absent (MV3 default only).
• privacy_policy_adequate api Policy fetched, scoped to extension, discloses collection, retention, and third-party sharing — adequate.
• no_bad_hosts_no_cves api threat_intel.bad_host_hits empty; cve_findings_raw empty; jquery 3.7.1 has no known CVEs.
• verified_publisher store Verified publisher badge present; domain resolves, not throwaway — partial trust signal.
• threat_feed_membership api Extension ID listed by TPCI chrome-mal-ids — Kokushibo Demon Slayer Gameograf [adware] + malext.io malicious_extension_sentry; score 4.44 -> 6.94 (+2.5 cap 2.5).

Permissions Breakdown

• search medium Allows manipulation of search provider; medium risk in isolation but combined with newtab override raises concern.
• host_permissions: https://api.gameograf.com/* low Scoped to developer's own API domain; limited blast radius.
• chrome_url_overrides.newtab medium Replaces new-tab page; monetization vector and persistent user-facing surface.

Pillar Scores

Bookkeeping