Malicious PDF — malware analysis report

Static analysis result for SHA-256 83079cbb9789c537…

MALICIOUS

PDF

39.2 KB Created: 2021-06-13 17:21:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: a6f72e5ac32f5817debd85d359a5ce42 SHA-1: fb249f20f94c983ed383eb9d41520787f4966c18 SHA-256: 83079cbb9789c537419460fc8e64c26c96bb6e80b2ed7d378559900578ea988d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a known malicious infrastructure. The document body, though heavily obfuscated, contains references to the same URL. This indicates a social engineering attempt to trick the user into visiting a malicious site, likely to download further malware.

Machine Learning

  • Nyx PDF Classifier clean score 0.0331

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.co/app/431946152/hack-and-get-a-roblox-account-banned-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_004_off00003a3a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3A3A 26792 bytes
SHA-256: d5edec87f4ea146716a09d2b8d0299ee16823d1bf67c57be71eceaa1524e56b0
font_01_sfnt_off00007690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7690 18600 bytes
SHA-256: c284637a75081c95b02d74fbb0eaea687f809e890187688ffcc818d2a62aac40

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