Malicious PDF — malware analysis report

Static analysis result for SHA-256 8637836dfd6b8b11…

MALICIOUS

PDF

34.9 KB Created: 2021-07-04 21:29:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54214dead8989bc1db38538d1f747d4d SHA-1: 403ee70906576ae0e2b07ac263e90bf871d9cdc8 SHA-256: 8637836dfd6b8b11ab6966f5682a68ec3f4d6744e03fe20778970569faabe0d2
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 0.9980

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.tw/app/431946152/roblox-people-girl-game-hack PDF link annotation
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-spins-on-coin-masters_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/roblox-hack-script-vehicle-simulator-infinite-money-script-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/fb-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-roblox-swordpack_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-cards_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-member-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/hack-avec-les-code-promo-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-put-a-hack-in-your-game-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-hack-into-someones-account-in-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/rocash-robux-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-coin-master-spin-app_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/unlimited-gameing-hacks-roblox-generator_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://digilib.ulm.ac.id/pusat/repository/free-robux-hackfor-any-decice_GM431946152.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_off000031fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31FD 22352 bytes
SHA-256: e042782126cdaf6cf737a6773bb0281bce6d26c8b45a546793e25bf6d5652391
font_01_sfnt_off000063b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63B9 18936 bytes
SHA-256: 75ea92108233b715cd36f91caa19c6aeb8e43e15172c6cc48177a75cf1b5b949

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