Malicious PDF — malware analysis report

Static analysis result for SHA-256 b896e866aa42aa9e…

MALICIOUS

PDF

36.2 KB Created: 2021-05-24 06:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9ce9d60a9ddea0621371b11c9de42676 SHA-1: e836ff5b677dd31e6a66e074b87baae91c7d5d38 SHA-256: b896e866aa42aa9e4131af500c5ee8848c5c4145e31df5852e2282da54c96d13
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains lures for 'free TikTok followers' and 'game hacks', directing users to a suspicious URL. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9492

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/free-tiktok-followers-instantly-game-hack PDF link annotation
    • http://smartint.com.my/images/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://smartint.com.my/images/coin-master-spin-ml_GM406889139.pdfIn PDF document text
    • http://smartint.com.my/images/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://smartint.com.my/images/free-robux-master_GM431946152.pdfIn PDF document text
    • http://smartint.com.my/images/blox-world-free-robux_GM431946152.pdfIn 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_002_off000031e3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31E3 25848 bytes
SHA-256: 87424581853aed243a93f736b089b7a5a8da00589f5b46a617f43de713c17d5b
font_01_sfnt_off00006c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C97 18100 bytes
SHA-256: f27faf11ab9b731ff59c8a2736de67f71ae1dcd874c0843e76df7710bacb1c6d

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