Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b4a27aeb7d4384d…

MALICIOUS

PDF

37.7 KB Created: 2021-05-24 01:12:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 26c10c71991bf91ba19d8cd6cd1603c2 SHA-1: 6cfaccd655ab929e589dea4e2a33481d72bbb758 SHA-256: 3b4a27aeb7d4384d6a1e6618ba89190300d39d225ecb96be5e7c11fd567e2be7
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 0.9447

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/how-to-get-free-spins-on-coin-master-game-hack PDF link annotation
    • http://torkelson.se/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://torkelson.se/images/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://torkelson.se/images/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://torkelson.se/images/free-robux-app-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_off00003298.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3298 29756 bytes
SHA-256: 3515ff150a76b9bfc139e16af00a266d7a34b182971c9a107aa9e5a90903027d
font_01_sfnt_off000072fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72FB 18052 bytes
SHA-256: ea84a6236c2a6e621998df031dd6ced14717eafc49be4f8ccfac8b30b37a9d36

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