Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cb44214d22626f…

MALICIOUS

PDF

37.2 KB Created: 2021-05-11 21:30:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: ca4387d7e9c39b47ad1fa8f7315c8c48 SHA-1: 479fe97ac1d8119260408477609b71942bf5d8ee SHA-256: 55cb44214d22626f5aac0e10fdf0e956accc9b62974d9968fa8fbfff2b21a54a
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack'. This link, https://netcdn.xyz/app/431946152/rbx-gg-free-robux-game-hack, is the primary indicator of malicious intent. The document body and other heuristics suggest a lure to download something potentially harmful, aligning with a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/rbx-gg-free-robux-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_off00003505.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3505 25464 bytes
SHA-256: e2d846409972a89e16e56544c915e3161cdeca0220ad393e10d9b37ecd6ce68c
font_01_sfnt_off00007028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7028 18304 bytes
SHA-256: d1ad45f5b083d36c6ec4c124be04f92537ae8dd31535970cb7662339535ad89d