Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d152cdb31a4c77…

MALICIOUS

PDF

36.3 KB Created: 2021-05-10 18:00:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4e83dbce4f41488b0a9f1107bf04644c SHA-1: cb6fbebd1086ef553a445c2dd7bad266565df37f SHA-256: a2d152cdb31a4c775377ad3f910c5d8c8dc14d3144b3b925f5e339f22eea3d48
130 Risk Score

Malware Insights

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

The PDF contains critical heuristic firings indicating it links to a known malicious redirector infrastructure, specifically promoting a 'free generator / game hack'. The embedded URL leads to a site that appears to be a lure for Coin Master free spins. While no scripts were explicitly extracted, the PDF structure and malicious link suggest an attempt to drive users to a potentially harmful website, possibly for credential harvesting or malware delivery.

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/blogger-coin-master-free-spins-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_off0000346f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x346F 24264 bytes
SHA-256: 15f86c6039dfda52956d6f724eb60856781981887ee758587c482c75df8a68f4
font_01_sfnt_off00006c11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C11 18464 bytes
SHA-256: 0911799b9aa5b6ecf8f75e1ae71094da345a4ed5579c86b7800e8f9c3f9f610d

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