Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f3553ee8acc43aa…

MALICIOUS

PDF

35.9 KB Created: 2021-05-10 09:49:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 0ab69b87a6d02d82000b736adfccecf6 SHA-1: 5b4484a5d347ac640b81a6257919d898ebc5012b SHA-256: 0f3553ee8acc43aa9d757ddb933d3e1807d2b02c50fa23aace2c39a0707563e4
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a redirector link that leads to a "free generator / game hack" lure. This link, https://netcdn.xyz/app/431946152/how-to-get-800-robux-for-free-game-hack, is associated with malicious infrastructure. The document body also contains similar text and URLs, reinforcing the lure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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-800-robux-for-free-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_003_off00003261.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3261 24208 bytes
SHA-256: 4730ea3f79d0f03cc0368d3305114227b20ec12eea2a60aceda78e2d848a39ca
font_01_sfnt_off00006989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6989 18664 bytes
SHA-256: 6a64e7471bea66bf256778f320a62da21f5461e8ce3828893f1d9cd09bca5c64

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