Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db684ce387ccae7…

MALICIOUS

PDF

35.8 KB Created: 2021-05-15 15:50:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9f82b066d025c1856184d07ef1d2ebb5 SHA-1: bce62cf35e91b70e5958e8a0138abb3ec31aa2d8 SHA-256: 0db684ce387ccae7edd5fdc11c4b2462b59f2a5d030d43bf35613c94804d414f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a lure for a 'free generator / game hack', directing users to known malicious redirector infrastructure. The document body contains text and URLs that reinforce this phishing attempt, specifically mentioning 'Coinmasterfreespinlink' and providing a link to a malicious domain. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier clean score 0.0265

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/coinmasterfreespinlink-game-hack In PDF document text
    • https://coinmasterspinandcoin.comIn 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_off000031e4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E4 25272 bytes
SHA-256: 3020220523d0928a8280c836efb672909f5d3eb6c3125700a1ef709beafc40da
font_01_sfnt_off00006adf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ADF 18224 bytes
SHA-256: 5ac1ce2ac88e7b98134a23e8a83b406c8e40c127b2dbab09a4edbea00c7c47cb

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