Malicious PDF — malware analysis report

Static analysis result for SHA-256 a815cd4dbbee8fa4…

MALICIOUS

PDF

40.0 KB Created: 2021-05-17 07:39:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 59df617aca49b3367e2fb9ba0c779083 SHA-1: 569dc91985068b8a8db9a3300da9491a08b93b5f SHA-256: a815cd4dbbee8fa4bdd8606d4484eb14f3e4131a851d0dfdcf60499b33056cec
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically a lure for a 'free generator / game hack'. The embedded URL 'https://netcdn.xyz/app/406889139/free-coin-master-cards-game-hack' is identified as malicious. While no scripts were extracted, the document body and heuristics strongly suggest a phishing or scam attempt designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier clean score 0.0128

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/406889139/free-coin-master-cards-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00003250.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3250 27920 bytes
SHA-256: 6fc09dd9c03738f647e9e2b4443a391f57d6e30d1fb809d7a50cec845a04dc46
font_01_sfnt_off0000713b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x713B 3080 bytes
SHA-256: 9451881c9e4ee55dfe4e445d6d7b88fe57c6d9ab900517537b6c81203ffef99c
font_02_sfnt_off00007bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF0 17884 bytes
SHA-256: 34dd8c80f69d0f68a5b5993274c8f1bdeef3254478921523cc39dd8566b84a5f

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