Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d0ea2526312d39…

MALICIOUS

PDF

43.6 KB Created: 2021-05-11 06:09:57 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: faa4d1659a6c6848a1081f9e5956811a SHA-1: e8a48bcf745756c86ed813bc3fe02b362b1cab56 SHA-256: 85d0ea2526312d39b8686494f0992caf58213f67ca7604fb74c77f31dfdcac1d
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically luring users with a 'free generator / game hack' for Coin Master. The embedded URL, https://netcdn.xyz/app/406889139/coin-master-game-free-game-hack, is identified as malicious infrastructure. The document body, though truncated, contains text related to the lure and the authoring application, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0119

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-game-free-game-hack In PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000337c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x337C 28336 bytes
SHA-256: caaf03bba9663bed76bec040ac1ed5af73e1fd337c3f30ad224a320ea31c7532
font_01_sfnt_off00007233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7233 4028 bytes
SHA-256: a17c2a746d49ac23b23e38a371e32fddecfcd91b10cf42ff6155bff6b8a07e91
font_02_sfnt_off00007fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FD4 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off000089c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89C4 17968 bytes
SHA-256: 6436b8b34fdc92ee071e8f70b1d9ea6d7bb3654b1ca6411cbe98dde64df1b4dc

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