Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc79788a0145525a…

MALICIOUS

PDF

36.8 KB Created: 2021-05-12 18:36:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1e6ece944b0f150a8139fabda5635421 SHA-1: cc9dd1fadd3a97f6f413b6dfcddf4b36e3aec996 SHA-256: bc79788a0145525aa07cbfb57d1eb5e91aed9a175fe9d32b6955071f78bfcb1f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to a known malicious redirector infrastructure, specifically advertising a 'free generator' or 'game hack' for Coin Master. The document body also contains a call-to-action phrase, 'CLICK HERE TO ACCESS COIN MASTER GENERATOR', reinforcing the lure. The embedded URL is the primary indicator of malicious intent, likely leading to a further stage of infection or a phishing site.

Machine Learning

  • Nyx PDF Classifier clean score 0.0292

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-spin-online-tool-coin-master-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_off00003535.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3535 25104 bytes
SHA-256: b01b8e0bbe586032ff43fcbb31d0a25f454a66827f7462fb54c6cf9a4a668b4c
font_01_sfnt_off00006f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F89 17960 bytes
SHA-256: ccd8a57ddc21ec57658e97dd2298d9591a9512a4c36f8c476c3f4a0a1231a43c

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