Malicious PDF — malware analysis report

Static analysis result for SHA-256 663d52454f7c4d7a…

MALICIOUS

PDF

39.1 KB Created: 2021-05-13 01:36:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 42a01dc2c1abf3892d3c4328ffac8054 SHA-1: 16353c7ca69b07238ee18919a91888f1d27b83dd SHA-256: 663d52454f7c4d7a766512c1d3f3bb93cad52d499f649eb04f1915cd0e1b3e8a
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically advertising a "free generator / game hack" for an online game. The document body and metadata confirm the use of wkhtmltopdf, and the heuristics indicate a lure for game-related cheats. While no scripts were explicitly extracted, the nature of the embedded links suggests a phishing or scam attempt to drive traffic to malicious sites.

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/free-coins-for-flip-master-online-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_off0000340b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x340B 25348 bytes
SHA-256: 127205b74fa9bddd3cc92dfd24bdce6dbac9ced0d114c4d1e5d1b824895cb6f7
font_01_sfnt_off00006d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D41 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off0000786b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x786B 17960 bytes
SHA-256: b8276a24b9e111d30e0b115559c7a2e7144cbebc25d18c1e5fb7b20d8e0a0542

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