Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dcc9268e0f21b9…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 15:43:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a1d25f4d48c84a03859f088407f864e4 SHA-1: 222d8e836e19bdbd1e445b7350aa5f3918477a6f SHA-256: a4dcc9268e0f21b99c51773e5411e68dee9da87f549e42ceae9593e93abb67b4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting free game hacks and cheats. The primary lure appears to be a "free generator / game hack" for Minecraft Dungeons, directing users to the URL http://netcdn.tw/app/479516143/minecraft-dungeons-free-game-hack. The ML classifier strongly flagged this PDF as malicious, and the presence of redirector links indicates a clear intent to lead users to potentially harmful content or further stages of an attack. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://netcdn.tw/app/479516143/minecraft-dungeons-free-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-cheats-switch_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-cheats-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-fan-club_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-legal_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/howto-get-free-robux-without-survey-and-verification_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/get-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-roblox-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-granny-money-cheat_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/hack-coin-master-net_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-roblox-and-get-robux-on-first-attempt_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-free-version_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/minecraft-apk-free-download_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F22 22856 bytes
SHA-256: a16052ac9af8b89d4066deaaf117301f5d63e13094bd7b175b829c9bd244434b
font_01_sfnt_off00006258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6258 18304 bytes
SHA-256: f6a577bc3f56294164eedaca4aa626844c61f0adb940d643d6f78e4abd993284

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