Malicious PDF — malware analysis report

Static analysis result for SHA-256 765e57302d4b3927…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 14:51:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 6282b64e4064e1f820741071f4fb4208 SHA-1: 10bfef0904af29bb011a1130c1afe3d98f2655f8 SHA-256: 765e57302d4b3927f03bba129b3c33bb9c594301eadf18db88189fbe67f5a506
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses an urgency-based lure. 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 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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-realistic-minecraft-texture-packs-game-hack PDF link annotation
    • http://library.fisip.upnvj.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-hack-online-link_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-links-for-free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-get-free-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/roblox-natural-disater-hacks_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/free-lil-pump-jacket-roblox_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/download-cheat-roblox-lumber-tycoon-2-money_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-hack-link_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/daily-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdfIn PDF document text
    • http://library.fisip.upnvj.ac.id/repository/coin-master-free-shield-link_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_off0000342d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x342D 22696 bytes
SHA-256: a2607b1d4e2edf17a50f64fa4c87211c8562f9b71ce91a4b016e683050eb3b13
font_01_sfnt_off000066e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66E3 18604 bytes
SHA-256: 39fbc29de02e3616a4bc97eee0e7f9e578843109fa26633a8b63f13f31b7fdf9

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