Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc5841502bb0136…

MALICIOUS

PDF

36.8 KB Created: 2021-05-16 17:31:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c29e50d249bd9ccabd1ce9e2d303bdb1 SHA-1: 5a00d201c62e747adc65df5f0c1f9b0f4f3d54d3 SHA-256: cfc5841502bb0136a7f4d212bfcfc3eddf5244e77bdd118a399bc40ccb97f0d2
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a malicious redirector link, specifically advertising a "free generator / game hack" for Robux. The embedded URL, https://netcdn.xyz/app/431946152/how-to-get-free-robux-2021-game-hack, is associated with malicious redirector infrastructure. The document body also contains similar text and links, reinforcing the lure. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the nature of the redirector suggests a potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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/how-to-get-free-robux-2021-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_off00003279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3279 25332 bytes
SHA-256: f2a2e3e10d08f1a03c8c25765cdd8e1968b671f2cc50e37ac57d1742c4d91ce2
font_01_sfnt_off00006d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D08 18684 bytes
SHA-256: 662354714a7c4aa127b8bd681013e9d5d113fbfc5a2f5afb2d34764175bb04a5

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