Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37138c6024ff285…

MALICIOUS

PDF

38.5 KB Created: 2021-05-15 06:00:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: dcbeb01279efe32ea9817e7d2adc7167 SHA-1: 6ce0ff334958ae415cece3ff4501f06c04f74461 SHA-256: e37138c6024ff285c2b28542300ed5c303664b87d8673fb9088ecb8a4d3426ff
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for 'Free Robux Hack' and includes a critical heuristic firing for a malicious redirector link. The embedded URL points to a site known for distributing malicious content. While no scripts were explicitly extracted, the PDF structure and heuristics suggest an attempt to redirect users to a malicious site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/free-robux-hack-no-human-verification-or-survey-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_off000031d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D4 27656 bytes
SHA-256: d5aea6de246b4b8306f2f4114bd69eaed1d409a60d11f22359a85faeb17487f0
font_01_sfnt_off00007226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7226 19324 bytes
SHA-256: 661bab6f3a048473b92ec1de100f4f76f72057f0f8e039014173720ccd048479

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