Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5406650df51e849…

MALICIOUS

PDF

39.9 KB Created: 2021-05-21 22:37:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fe460be0eafca73896ff7318f41f5ff9 SHA-1: ebc4f92950b73842f8945b13cee2da7f533cdd92 SHA-256: a5406650df51e849c27f25fec3bbfa2a2103f4f9250b04303de3af2a9bbc52e7
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links disguised as game-related cheats and free currency generators, a common lure for phishing or malware distribution. The primary link points to a URL associated with game hacks, and other embedded URLs redirect to similar content. While no scripts were directly extracted, the PDF structure and heuristics indicate it's designed to trick users into navigating to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

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/406889139/coin-master-free-spins-today-daily-links-game-hack PDF link annotation
    • http://arch-centr.ru/images/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://arch-centr.ru/images/how-to-get-minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://arch-centr.ru/images/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://arch-centr.ru/images/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • http://arch-centr.ru/images/how-can-i-get-free-spins-on-coin-master_GM406889139.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_002_off000035cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35CD 25496 bytes
SHA-256: f9cd5fd209a4986ed7e0de29ec6efa6069e550e663cbe22b35be79797a5647ac
font_01_sfnt_off00006fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 2820 bytes
SHA-256: 96a70491b0783ad8c6fc9b11a18f021aa22c69ac41ee4499b781d16a1b99b689
font_02_sfnt_off00007955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7955 18652 bytes
SHA-256: 52d597ff4b9023df6b3510b92f87dc1d2329aed0448bc9fa59130058567cb992

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