Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c473ea90b5228f9…

MALICIOUS

PDF

36.6 KB Created: 2021-05-15 04:10:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a366a3a29337be464a8fa91afc88b4dd SHA-1: 09b8978113c049717f317e6b08a0ac4c622e0ef1 SHA-256: 5c473ea90b5228f9b8c062c6fd1efefa77f1d16f1a93861305cc6c8bea9f0af9
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains heuristics indicating it is a lure for a "free generator / game hack" and links to known malicious redirector infrastructure. The document body explicitly mentions "Coin Master Hacks For Free Spins" and provides a call to action with a URL that leads to malicious content. The embedded URL is the primary indicator of malicious activity.

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/coin-master-hacks-for-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_off00003520.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3520 25472 bytes
SHA-256: a9bde9d7130b286cce4543576a5c9bdbf39e5faf60e0410364a1645e552af779
font_01_sfnt_off00006e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E54 18056 bytes
SHA-256: 12d79a7ddbb75c7a0854102822057d5441bee2ca4a20c79f8211a3d0b9a1f375

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