Malicious PDF — malware analysis report

Static analysis result for SHA-256 0836a77a9f4444f4…

MALICIOUS

PDF

39.1 KB Created: 2021-05-24 00:07:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d2c95b95ac80700ffb0bb7623dedb034 SHA-1: aa07b7b5d01875541cb957e9fe7280c9c71361f8 SHA-256: 0836a77a9f4444f4cb9353884b39a2ff0c90c939fccb1c4d54d9c7e317cfbe0a
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 0.9476

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/free-robux-no-human-verification-or-survey-or-download-game-hack PDF link annotation
    • http://colsaf.co/images/coin-master-spin-hack-trick_GM406889139.pdfIn PDF document text
    • http://colsaf.co/images/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/codes-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://colsaf.co/images/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • http://colsaf.co/images/get-free-robux-2021_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
stream_002_off00003491.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3491 26584 bytes
SHA-256: 962c66d2e702af99ad1e6c7455c3d0a090a00c9281e971b3f9c2d316b345c9fe
font_01_sfnt_off00007326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7326 19736 bytes
SHA-256: 59e4374f8172b973ba9217c83b5ce6b26483f5ae1ceeffd331798f57e1658bad

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