Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3e2f7d8428e822…

MALICIOUS

PDF

37.2 KB Created: 2021-05-19 20:02:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: da694703f1df839f41d6424505746155 SHA-1: dd89820c7249a44346fb98540d5c07d1f01864e4 SHA-256: 4c3e2f7d8428e8225d305065345caa973309c846b01b8860d40866bb98f80130
170 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a lure of "Free Robux Hack No Human Verification Or Survey" to trick users. It contains embedded links pointing to a known malicious redirector infrastructure, specifically https://netcdn.xyz/app/431946152/free-robux-hack-no-human-verification-or-survey-game-hack. The presence of a fake CAPTCHA heuristic further supports the intent to deceive users into interacting with malicious content.

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/free-robux-hack-no-human-verification-or-survey-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_off000033c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33C6 25636 bytes
SHA-256: af9f44f866c8675646ff2476404385aa2a2071b08301b6a8dca766dadffd2061
font_01_sfnt_off00006ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CED 19324 bytes
SHA-256: 661bab6f3a048473b92ec1de100f4f76f72057f0f8e039014173720ccd048479