Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bae306d837cbe95…

MALICIOUS

PDF

28.5 KB Created: 2021-06-22 11:10:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 0ee6b2c38ea08339b981c4bc601587ea SHA-1: 6a012897ff4e04967b8e184696a54e51c63c13c1 SHA-256: 4bae306d837cbe959f45e73cba4644c33d8a545e8d2bd0839b3462b472927c41
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure for a 'Coin Master Hack' and a critical heuristic firing for a malicious redirector link. The embedded URL directs users to a site that likely serves a second-stage payload, attempting to exploit the user's trust through a fake generator. No scripts were extracted, but the PDF structure and heuristics indicate a social engineering attack.

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.co/app/406889139/coin-master-hack-no-survey-or-verification-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_off000019f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F9 22732 bytes
SHA-256: 2cbf90ab07e18ceecdb613f56dfe9505ad8b89e1fdcd89a8bc78d1a69731012f
font_01_sfnt_off00004cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4CF5 18572 bytes
SHA-256: 3714ff820157558559e7d0653201827560acd429746c0784f855fbf1e368d380

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