Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a81934c0a7e7da…

MALICIOUS

PDF

39.1 KB Created: 2021-05-11 19:30:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: decbf9600ec63d40ea53fa53cb92702e SHA-1: ffc9b76b269feade05952f6cb0b1e0f4d6ddd38a SHA-256: 77a81934c0a7e7daeba31f437f11fc8ce1a573a4abe761486a3caef7936f041f
130 Risk Score

Malware Insights

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

The PDF contains multiple critical heuristic firings indicating it links to malicious redirector infrastructure, specifically a 'game hack' lure. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-free-spins-1-coin-master-game-hack, is identified as malicious. The document body also contains a call-to-action phrase, reinforcing the lure.

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-free-spins-1-coin-master-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_off0000346b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x346B 25148 bytes
SHA-256: 3e6e3e6546e71b670b22068288b6e7d6a28dd7630c2d740366810eaef93bc0a8
font_01_sfnt_off00006e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4C 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00007837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7837 17992 bytes
SHA-256: 6d8d99a319dc3508354c514a9dfb36b9314a67d789b860417dc5e127b03e5453

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