Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d71b2f2965e4c67…

MALICIOUS

PDF

47.9 KB Created: 2021-06-11 00:38:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f69fc99782da6c170853854c36f5f6c7 SHA-1: aa085dec5f38a52022fec27b8f6c7b87350cb548 SHA-256: 0d71b2f2965e4c67180a5b034e3ae18962576ac6633ae44f44172b41be4c6ed8
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 0.9796

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 https://netcdn.tw/app/431946152/roblox-item-codes-free-game-hack PDF link annotation
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-phantom-forces-credits-hack_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-do-you-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-infinite-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-app_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/rbx-hut-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/mcpe-master-unlimited-coins-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-hacked-client-bedrock_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-studio-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-for-roblox-super-power-training-simulator_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/fly-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-use-python-for-hacking-roblox_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/watch-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005284.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5284 25804 bytes
SHA-256: b517fd6c7fb274f31a57e206feba7265c0d53853906871e637c5916848729011
font_01_sfnt_off00008e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E15 2844 bytes
SHA-256: a66b570a908761b39e6d9e18bcb667c353840a86c6a7db528f79d01abe6b23a1
font_02_sfnt_off000097bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97BC 18488 bytes
SHA-256: c769f821826bdb4f77787645e318f9986cad09e49e406cf77a1b6495aec1db16

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