Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbdf1eaf6df796ab…

MALICIOUS

PDF

30.9 KB Created: 2021-07-22 17:31:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cbb135e08acfc215aecf31f44b431cd3 SHA-1: 28d8adad5fc77a3bb4fbc3ca5869ef2c94cf5863 SHA-256: dbdf1eaf6df796ab1cdda0aea82f60c2d966df465c52808ad8bd94c207bf3361
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing indicating it links to a malicious redirector disguised as a game hack generator. The embedded URL, http://netcdn.tw/app/431946152/robux-free-2021-game-hack, is identified as malicious infrastructure. The document body also contains this URL and a call to action, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier clean score 0.0564

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/robux-free-2021-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
font_00_sfnt_off00002338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2338 22800 bytes
SHA-256: 67b70c7972b7e5eae34e89af627b9785b069ac47423df0e4c901bbdcafc27c7f
font_01_sfnt_off00005670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5670 18600 bytes
SHA-256: 707a6d454891e35f388a0d8205a2e46c0fc3a373aa9514799a3734f761808fc4