Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4886e0a9d8a513…

MALICIOUS

PDF

32.9 KB Created: 2021-06-19 01:30:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75fe83b90320cc72ce709ab223b00643 SHA-1: 23015fc8c25ef3c5266cb80eabdcf5ec5a1f168f SHA-256: 8b4886e0a9d8a5130808688a8e8d0bf3a1ff1a0d5aac73cc2b95dba9b7ffb431
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.co/app/431946152/roblox-hack-scrit-2021-game-hack PDF link annotation
    • http://digilib.iailm.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-hack-no-download-no-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-april-fools-hack-face_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-vehicle-simulator-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/real-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/robux-hacking-bans_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-free-foxy-food_GM406889139.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_off00002a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A79 21856 bytes
SHA-256: 58e2ae7bcb86af9c306bba967b90e262dd8ef2af1d68b49de758d58c5d535e68
font_01_sfnt_off00005af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5AF9 19280 bytes
SHA-256: e1d38cf95a32d569b089c24cfd1c0f7b61361c6f63f4622dc48b812c6ea5e412

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