Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8791ff556b4208…

MALICIOUS

PDF

36.2 KB Created: 2021-05-15 17:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: b957b2abee3c17ced4e4c013b04ed1b3 SHA-1: f5b876de83736e10436195daa04f828531468310 SHA-256: 3f8791ff556b420899f38d92676b25cfd214fdeca65bdc554df7ea88dcb3d5fa
130 Risk Score

Malware Insights

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

The PDF document contains embedded links that redirect to a 'free Robux generator' lure, which is a common social engineering tactic. The heuristic firings indicate that the PDF links to known malicious redirector infrastructure. While no scripts were directly extracted, the nature of the lure suggests an attempt to download and execute a secondary payload, likely via a client-side exploit.

Machine Learning

  • Nyx PDF Classifier clean score 0.0283

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-generator-no-human-verification-game-hack In PDF document text
    • https://krnl.rocksIn 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_off000031b6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31B6 25324 bytes
SHA-256: 7e0f4096710bfe57177f20d1e0b68fa608a49fc2409f4613e58347c7208187df
font_01_sfnt_off00006a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A59 18860 bytes
SHA-256: f1337887e63f46ec65b145f76804780e669468724c6330ac6fa0452b843b30d3

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