Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90abcff7bac3cad…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 17:38:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 178bdced0a02b69b326058bbdbb6b5a8 SHA-1: 8c5381ac40c92b9114511e1d633dee69ebfa5771 SHA-256: f90abcff7bac3cad59cfe79357b7827965d441a44dbdd448d121e3f22d8e620a
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/479516143/free-minecraft-server-game-hack PDF link annotation
    • http://lib.icbc-indonesia.org/repository/how-to-make-cheat-engine-undetected-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-crashes-every-time-i-run-cheat-engine_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-hair-on-roblox-for-girls_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-free-body_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spin-trick_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-dungeon-quest-hack-trainer_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-on-prison-life-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-rewards-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-into-someones-roblox_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-free-apps_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-hack-confirm-passord_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-gg-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-cheats-for-mac_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_off00002fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE1 22188 bytes
SHA-256: ee41dfd8b333d282a0bd0215e62e0726ca2e366ade0f6990df467e564c64afca
font_01_sfnt_off00006136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 17968 bytes
SHA-256: 467ba59745922621ddb9e57f68c7b79a6418f7a75fac5793c5b2ba4d9bdeb419

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