Malicious PDF — malware analysis report

Static analysis result for SHA-256 238526b5e4e09e08…

MALICIOUS

PDF

36.5 KB Created: 2021-05-14 08:30:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: d931ec219d43777cb42635ced9ce1010 SHA-1: c1dd02c061b9699254d13d6c43ae04e63ddf2749 SHA-256: 238526b5e4e09e0817d27856009122c28f1901ded6019906b32abb803de51a32
130 Risk Score

Malware Insights

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

The PDF document contains a lure for free Robux, directing users to a URL associated with malicious redirector infrastructure. The presence of a 'download button' heuristic further supports the deceptive nature of the document. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0312

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 https://netcdn.xyz/app/431946152/free-robux-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_off000033d8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x33D8 24976 bytes
SHA-256: cb373d8d232335393143be4b0c3be2ea1c2b431dfcf3c753101d5bf61781e4b3
font_01_sfnt_off00006d5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5F 18308 bytes
SHA-256: 74a940f1217583ab80956cd168fb81f959241543e2b3413e790743682303989f

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