Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c3bd3513c29d14…

MALICIOUS

PDF

34.4 KB Created: 2021-05-24 07:09:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 860e67c08de875dcfe8641a54a94f3ff SHA-1: 533679befb0b5b9d804c4929675ea65a3bcde1e5 SHA-256: c9c3bd3513c29d14f21ad3d5daa14efb0d58665b1ce81f2a9d8211c55afed3f2
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs social engineering by presenting a lure for 'free Tiktok Fans' and 'game hacks', directing users to malicious URLs. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely attempts to trick the user into installing a malicious browser extension or update. The presence of multiple suspicious URLs suggests a download or redirection chain designed to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9508

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/free-tiktok-fans-no-verification-game-hack PDF link annotation
    • https://www.audev.com/images/hack-client_GM479516143.pdfIn PDF document text
    • https://www.audev.com/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://audev.com/images/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.audev.com/images/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • https://audev.com/images/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.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_002_off0000310a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x310A 23480 bytes
SHA-256: 27512c416b84b832649497677151506f374e558b3a20e472a1b8bece3d04d7b6
font_01_sfnt_off00006656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6656 17816 bytes
SHA-256: db30cff21771a834018d301e3e15668d4f696dd14c251b75c79f93eed26cd5f9

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