Malicious PDF — malware analysis report

Static analysis result for SHA-256 87bfc810af2e9df3…

MALICIOUS

PDF

38.8 KB Created: 2021-05-10 11:35:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: fa91513364ea3caa51f1f8e9e2c96921 SHA-1: e4da0c217d061f99279d95526244ce1206d22707 SHA-256: 87bfc810af2e9df36552b7306d5c8be09b17671577cd1f1463d280ceace3fa47
130 Risk Score

Malware Insights

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

The PDF document contains a lure for a "Coin Master Hack Trick 2021" and a prominent "CLICK HERE TO ACCESS COIN MASTER GENERATOR" button. This button links to a known malicious redirector, indicating a phishing or scam attempt. The PDF structure and embedded URL suggest it's designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery.

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/coin-master-hack-trick-2021-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_off00003582.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3582 24156 bytes
SHA-256: 5b81a9a9c37ce671d7508f2bf99654b166903fae0fcc76cea6f78e715e266ee6
font_01_sfnt_off00006c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C7B 2868 bytes
SHA-256: d2d857e2ddc1082c7667b23f2135a5c0ba26a2ff8b42c86c89c8e0b09aece855
font_02_sfnt_off00007666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7666 18116 bytes
SHA-256: c4260f5e787f6e7dffce264d62518f3a61bcf9e6f1fccfaba9053fe678d6f70c

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