Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcef9a5f119bfda6…

MALICIOUS

PDF

46.9 KB Created: 2021-06-07 03:44:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: c36bf47966132b7fa6c965dd88d7b898 SHA-1: ece534e48cf8e4f11eff996a990553d447cec3a3 SHA-256: fcef9a5f119bfda64a58badb3315bab0e1f104a86e0fd1f7bc170047b8debccf
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to a 'free generator / game hack' lure. The embedded URL, https://netcdn.tw/app/431946152/roblox-gae-free-game-hack, is identified as malicious infrastructure. The document body and PDF facts further corroborate the lure by mentioning 'Roblox Gae Free' and a call to action, indicating an attempt to trick users into visiting the malicious site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0319

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.tw/app/431946152/roblox-gae-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00003bef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3BEF 26364 bytes
SHA-256: 8a7d125069c314d85db99d5eb3a6ff54865b2f7d8a4a6e9b39f558586f3fbbda
font_01_sfnt_off000079f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79F9 8704 bytes
SHA-256: ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490
font_02_sfnt_off00009663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9663 18176 bytes
SHA-256: eedec1cee2b429160464f9b3035f1aa06091e0a87d75ec1eb0c900fe7ef92ae3

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