Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8531009bc318e5…

MALICIOUS

PDF

30.4 KB Created: 2021-07-20 14:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 582f72ab27448e7c892d09370b24702e SHA-1: c5b778f6ee7d7b642429995b0ffa2dbb8f083fd4 SHA-256: 9b8531009bc318e5a457064573e68bfc03b2ddd3d4b1d7666a9ff596df83f619
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a critical heuristic firing for a game hack redirector lure, pointing to a URL that is known to host malicious redirector infrastructure. The document body also contains the same URL and a call-to-action phrase, reinforcing the phishing attempt. While no scripts were extracted, the presence of a malicious link and lure suggests an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier clean score 0.0560

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 http://netcdn.tw/app/406889139/how-to-get-free-coins-on-coin-master-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_002_off000022b4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x22B4 23116 bytes
SHA-256: 0a39625b70271d32de460ff3dd0445e698ee971476d3cba3b9c46aaf5dcc212c
font_01_sfnt_off00005688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5688 17872 bytes
SHA-256: 51f02da227d0679d4a4cca1b372203100e5a9ff6587b3c267ccf786d3222cbcf

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