Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f643fa16aae350…

MALICIOUS

PDF

28.6 KB Created: 2021-07-05 06:19:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3acae29243cc0db5aa4be1a6783c9e00 SHA-1: a231dace01bf1875872e3969d9d94185f977ddc4 SHA-256: 94f643fa16aae350468a48a8105fe7d1f7a4cdf30bf4bd8c1885a657f1fe4eb4
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 lure for 'free generator / game hack'. The embedded URL 'http://netcdn.tw/app/431946152/free-roblox-pin-codes-game-hack' is identified as malicious infrastructure. The document body, though heavily obfuscated, contains references to 'Free Roblox Pin Codes' and a 'CLICK HERE TO ACCESS ROBUX GENERATOR', reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and the nature of the embedded link suggest an attempt to redirect the user to a potentially malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier clean score 0.0330

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.tw/app/431946152/free-roblox-pin-codes-game-hack In PDF document text
    • https://www.roblox.com/.IIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 3

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_001_off000018de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18DE 22980 bytes
SHA-256: c1e0c20d22dd3009f6834f428969e0dd7523c4afdd55e7e3c5df865dfa3da43f
font_01_sfnt_off00004c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C4F 19096 bytes
SHA-256: 4ea276f1d2d398dd256481d8d50d8281b25bd33319bb11349576f795fbfa1b33

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