Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94a2fc5d72db4c1…

MALICIOUS

PDF

35.3 KB Created: 2021-07-19 18:11:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 02edbd23a0f9132d829082fe2a3be5ce SHA-1: 2a9b89772a29e4ab5636f8cd98b34503a09806ad SHA-256: c94a2fc5d72db4c12694b0c147e074c3d53122572c80ea11bd7cff9e5a6828b9
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link that redirects to a game hack generator, a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure itself contains embedded URLs that likely lead to malicious content or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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 http://netcdn.tw/app/406889139/coin-master-free-spin-and-coins-links-2021-game-hack PDF link annotation
    • https://pneukalousek.cz/images/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://pneukalousek.cz/images/is-minecraft-free_GM479516143.pdfIn PDF document text
    • https://pneukalousek.cz/images/free-robux-please_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • https://pneukalousek.cz/images/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pneukalousek.cz/images/how-to-install-minecraft-for-free_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_off000031ee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31EE 23388 bytes
SHA-256: 9abf800e1d8a9c4072153014da54b2bc852f2a0a7e6202ee0d7fa106005de0c7
font_01_sfnt_off000066d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66D8 18632 bytes
SHA-256: bf450557b00699bdc36230f8bff75cef2d4ddc3329c11821453b6bd8c7be45f9

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