Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdd5ab34da72f8be…

MALICIOUS

PDF

43.9 KB Created: 2021-04-28 11:09:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6151d73e79ef228d7ff57fa91e8f638e SHA-1: 9958265b9b5052a52c856cea19b49f29d50a86b3 SHA-256: cdd5ab34da72f8be0dc49822c7f3fe1c714aaad247416062985d5ff219d8fbcf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link to a "free generator / game hack" lure, indicating a social engineering attempt to redirect the user to a potentially malicious site. The ML classifier also flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of external URIs and the nature of the lure suggest a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

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/431946152/nike-roblox-shirt-free-game-hack PDF link annotation
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-doge-head-on-roblox-for-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/daily-free-robux.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/roblox-free-eminem-clothes.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-get-a-free-skin-in-strucid-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/does-roblox-use-an-anti-cheat.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/easiest-ways-to-make-robux-on-roblox-for-free.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/how-to-cheat-on-you-roblox-girlfriend.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-models-for-roblox.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/jack-hack-robuxcom.pdfIn PDF document text
    • http://www.saburai.ac.id/elibrary//repository/free-roblox-toy-codes-december-2021.pdfIn 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_off000044c6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x44C6 25660 bytes
SHA-256: da3b96d0ece8fb0a3d3278b8ce831d3c48ba58dcb7a4e306934634125146991a
font_01_sfnt_off00007f8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F8A 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off0000894c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894C 18508 bytes
SHA-256: 91653d5b0d8493286780e99ba6262bde065aaf1b339bce53028c55cfdc46d3bf

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