Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3ef70c5534988c…

MALICIOUS

PDF

36.2 KB Created: 2021-05-22 17:03:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 9db1537812b59e20a48323faff0076e0 SHA-1: fa99337d961230a3af5e25ca6fede75523176361 SHA-256: 6c3ef70c5534988ca76be79026d3beb4ae185b658411203c05c41410b8dccb79
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 0.9492

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/roblox-jailbreak-hack-game-hack PDF link annotation
    • http://act.gr/images/minecraft-free-download-linux_GM479516143.pdfIn PDF document text
    • http://act.gr/images/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://act.gr/images/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://act.gr/images/free-robux-group_GM431946152.pdfIn PDF document text
    • http://act.gr/images/roblox-hack-generator_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_off00003230.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3230 24808 bytes
SHA-256: 60c59cc8ee1141556a3bbd779fa3581c9c0855e0e99e87d902c1b4567b0cfd2c
font_01_sfnt_off00006b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 18468 bytes
SHA-256: deecbf3382f29be7f744c5f376599cf902ae77510bc823f5987ac0412c139863

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