Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31d0ff1787cb118…

MALICIOUS

PDF

39.4 KB Created: 2021-07-04 01:31:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: fda5d216b4e2a7133bd28d32a0ac0c52 SHA-1: a7249996d20e048bd251692aabfd0374d444a856 SHA-256: c31d0ff1787cb118cbd83fe951d0f7d1e014d2dfd2019de7ab61324c895ad3df
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file 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 0.9985

Heuristics 4

  • 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/free-robux-with-no-verification-2021-game-hack PDF link annotation
    • http://www.pspmrsmkkb.com/webopac/repository/cheat-cashed-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-deadcores-in-labyrinth-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/robux-sites_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/aristois-minecraft-hack_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-roblox-girl-hair-not-a-model-or-decal_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-get-free-skin-in-cs-go-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/denis-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-cheat-engine-speed-hack-script_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-skyscraper-tycoon-cheats_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/roblox-sexually_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkkb.com/webopac/repository/free-robux-2021-no-verification_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_off00004057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4057 22644 bytes
SHA-256: 1722f1757161b3b5e7450a3d359fc24032bb358e9c16b19cb6011dcaae12808b
font_01_sfnt_off000072da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 19840 bytes
SHA-256: bf7c23b41782422fa131bc9f6708f01af46f806364d2ae517c2179326a085b42

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