Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fcce4c584ee53c…

MALICIOUS

PDF

42.7 KB Created: 2021-05-11 22:37:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: fbbecbc5b2597dcd8fef7c370803747e SHA-1: 0a6e98759f571f45afbfead140868007257282a6 SHA-256: d5fcce4c584ee53c479c73ca7b3eb8d94a0a8b45947e4e14d47bb04e824e8f2a
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

This PDF document was flagged as malicious. It uses a fake-CAPTCHA lure. 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 clean score 0.0118

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/free-coins-game-hack PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000307d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307D 23984 bytes
SHA-256: 9c2979f429bfb38d28975bcc79b02ca30b9d34e09e3296d5b409dda63d2ed7c3
font_01_sfnt_off0000673c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x673C 3560 bytes
SHA-256: c953d730e49f69c7d62e02a926729ae4a31de13d9a976dc4a95b39cf47066c93
font_02_sfnt_off000073bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x73BD 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off00008848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8848 17380 bytes
SHA-256: 4587a0da3d318d3aab2e4d3a2e17e88175961c64bd2fb3ac3dbf4933656e475a

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