Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f3f0bf9db7b4d8a…

MALICIOUS

PDF

38.9 KB Created: 2021-05-18 04:35:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b41f9388e2a5635ddb3e310297730d45 SHA-1: 1714b853d54906c784dc58f25ff0f2837d43dd28 SHA-256: 2f3f0bf9db7b4d8a8b7b6f14d4263a0d20e5118f07ece0e2a6181e351f9af40f
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, directing users to a suspicious URL for 'free Robux'. This indicates a phishing or scam attempt designed to trick users into visiting a potentially malicious site. The document body and heuristics confirm the presence of a fake verification prompt and an external URI, suggesting an attempt to lead the user to a resource that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/how-to-get-free-robux-no-human-verification-2021-game-hack In 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_003_off000032d3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x32D3 29100 bytes
SHA-256: 30e529340520a494aa6642ea885993b9d5f44ea4b9a486943971d14e183e01b2
font_01_sfnt_off00007372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7372 19428 bytes
SHA-256: dc7c459a90b1a398d2ee51f52972ed8a07904c77cd045887558a99bdb9823e3c

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