Malicious PDF — malware analysis report

Static analysis result for SHA-256 01937847e3d68fdf…

MALICIOUS

PDF

26.4 KB Created: 2021-07-04 08:51:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: dcdfdd3459fbd79aa6031a946b0ae1d8 SHA-1: c82242a50b9389391f5562c105c92eed9893304c SHA-256: 01937847e3d68fdfa7e3ed19b9e34b3c8295bd5aa18105b0ac168d9ebe754586
130 Risk Score

Malware Insights

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

The PDF document contains a critical heuristic firing indicating it links to a malicious redirector disguised as a 'free generator / game hack'. The embedded URL, http://netcdn.tw/app/431946152/buy-robux-free-game-hack, is associated with malicious redirector infrastructure. The document body also contains similar lures and the authoring application suggests it was generated programmatically, likely to host such malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.0327

Heuristics 4

  • 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.
  • 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 http://netcdn.tw/app/431946152/buy-robux-free-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
font_00_sfnt_off00001471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471 21456 bytes
SHA-256: e57edbb90ca18ec990917362786d662ad0978a523d92fcc8d59be5cf9c8af07b
font_01_sfnt_off000043a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x43A4 18896 bytes
SHA-256: ccd8092a29b5f0d371053c4589a9eddce3d36397c57223c60c61c3f4d0a73278

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