Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4576ea77458e0dc…

MALICIOUS

PDF

39.9 KB Created: 2021-04-27 09:48:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9b398e4bb163528714136c76f1dbb8f6 SHA-1: 0e8b72b68f4f0985666c5f2f81db07444b887150 SHA-256: a4576ea77458e0dc1ada5280958b5ec6f13005dfcc28bbf4639ef54aa09921be
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 0.9941

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 https://netcdn.xyz/app/431946152/tycoon-money-hack-roblox-game-hack PDF link annotation
    • https://lib.stie-yai.ac.id/repository/cheat-engine-roblox-bypass-zip.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/diamond-roblox-hack-jailbreak.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-obby-august-2021.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-cheat-script-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-robux-roblox-rom.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/hacking-game-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-into-peoples-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/free-printable-roblox-birthday-card.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/how-to-hack-into-builder-mans-account-roblox.pdfIn PDF document text
    • https://lib.stie-yai.ac.id/repository/roblox-how-to-get-free-limiteds.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
stream_003_off000041ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41FF 24068 bytes
SHA-256: 4d7ba0fa9ae4dead88d58d266e0a0489e702f116d39cf135a0c81d7893884c60
font_01_sfnt_off00007919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7919 18560 bytes
SHA-256: 49236e4b44aed1b8ecff292aa10246c075472ea6302b6a7cf61b53ea0b787c1c

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