Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5acdfc782e3d300…

MALICIOUS

PDF

38.5 KB Created: 2021-05-13 19:00:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 49e2c8292a82ace7a88e1574978b7f44 SHA-1: 0d64d0b5211f7404d1c545870a5c5fbb6fefb395 SHA-256: f5acdfc782e3d3007469d27cf625948e6bc71ac836c1cd373cd27c2e570f3866
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising a "free generator / game hack". The document body and heuristics indicate a lure to a scam website. While no scripts were explicitly extracted, the nature of PDF redirects often involves JavaScript execution to facilitate the redirection, hence T1059.007 is included.

Machine Learning

  • Nyx PDF Classifier clean score 0.0334

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/431946152/how-to-get-free-robux-on-ipad-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_off0000352c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x352C 27292 bytes
SHA-256: 9b3fd2e1bd827bc87ee6c4da3a312512b42570569f3131e48b0e680cf4394c78
font_01_sfnt_off0000736c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x736C 18860 bytes
SHA-256: df018bfb15659bb80b7243956be10673ebd99e13a4c75edb6b924f306f4c3bfe

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