Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd87afd94019dee5…

MALICIOUS

PDF

32.3 KB Created: 2021-07-29 13:11:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b5dd2cf140e0e2c1ac14bd2a4ebb5b4e SHA-1: bdcf93c2098c2777a9bbc1dbce0fbbb1f0de783e SHA-256: cd87afd94019dee51d33f16342c6922440dab02fb3ed5609bf364c1e8556893c
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in 'free Robux' or 'game hacks'. The primary malicious URL, http://netcdn.tw/app/431946152/free-robux-websites-that-actually-work-game-hack, is embedded within the document and linked to by heuristics. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier clean score 0.0622

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/free-robux-websites-that-actually-work-game-hack In PDF document text
    • https://www.roblox.com/.IIn 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_off000024f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24F3 23408 bytes
SHA-256: ae2dbd8035562a31c25a05b3037fa7355a634d966941a510625805a0af823a1c
font_01_sfnt_off00005988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5988 19440 bytes
SHA-256: 6ca5a42b15f03ce8f0527a9b99e2a0be619c538984e0635b30c2c3344ed7d0ad

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