Malicious PDF — malware analysis report

Static analysis result for SHA-256 1261a3911060ffe6…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 00:11:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 665382e2b4ecbdbe6542a2f3cebeb268 SHA-1: 99d09f730b826a6f768c9936df4dcc83730962b4 SHA-256: 1261a3911060ffe6bc1ff22a684368ebe63ae7e514311e8ad07de7d7f368218e
130 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically disguised as a 'free generator / game hack'. The embedded URL leads to known malicious infrastructure, indicating an attempt to trick the user into downloading a secondary payload. The document body, though heavily obfuscated, contains references to the lure and the authoring application, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.0125

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/legit-coin-master-hack-october-2021-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_off000038b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x38B2 25156 bytes
SHA-256: 7430ad1aaf8335358499f9461382696e77b324aabc587fee5e67035d93598cd9
font_01_sfnt_off000071f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71F0 4624 bytes
SHA-256: 82842ba9511da58fef2265c4a83e5b0c273273c6b988c9474d3f316814e3d432
font_02_sfnt_off000081bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81BC 18564 bytes
SHA-256: 56b4f24fc9847ca249e337f5cec44192b38f8002a6131b91275db6b901cbab0a

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