Malicious PDF — malware analysis report

Static analysis result for SHA-256 4085a98941856c77…

MALICIOUS

PDF

40.8 KB Created: 2021-05-17 19:17:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: caae12c968721bd6c12f0ef93f36ebf4 SHA-1: 795cbb6b003b1447ad70c82d72463271e73f5f70 SHA-256: 4085a98941856c77721a4ec557b8bf30f548078e53a6204f9f00467bb772ba85
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising a 'robux miner game hack'. The document body and embedded artifacts suggest a lure designed to trick users into clicking these links, likely to download a second-stage payload or lead them to a phishing site. The presence of a fake CAPTCHA heuristic further supports the intent to deceive the user into interaction.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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/robux-miner-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000320b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x320B 27092 bytes
SHA-256: d90dada1ab86cb53a1749483606cbc45d8a332c5c78fcf02d844127750b0bfe3
font_01_sfnt_off0000719d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x719D 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off00007e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E45 18168 bytes
SHA-256: 92c1dc62f701fc46bda7a736e087260fd47c015b1cecaf90561e375dcfd5c8ad

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