Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b63606dc1348787…

MALICIOUS

PDF

39.0 KB Created: 2021-05-17 15:04:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: b2203c29c83c79a2d51e8a7798ce6635 SHA-1: c8bbece028ded4ba100b9e161af8c2d243baf2f4 SHA-256: 8b63606dc1348787b368e00efc912233b1c85e3199d4f2b65286971b07102173
130 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links and text lures, such as 'Free Robux Survey' and 'CLICK HERE TO ACCESS ROBLOX GENERATOR', directing users to a malicious URL. This indicates a phishing attempt to trick users into downloading a potentially malicious file. The presence of embedded URLs and the lure suggest a phishing attachment attack vector.

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/431946152/free-robux-survey-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_off00003257.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3257 25016 bytes
SHA-256: fdfb69753c5fba8e5543dfb31ac20ceb1d6e5d65c6f60c34237ac995276f2bb6
font_01_sfnt_off00006c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C60 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off0000768c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x768C 18308 bytes
SHA-256: 74a940f1217583ab80956cd168fb81f959241543e2b3413e790743682303989f

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