Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff9adc4608dcaea9…

MALICIOUS

PDF

40.9 KB Created: 2021-04-24 03:09:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 57d570b636fd611510f781c7efe16bef SHA-1: 389cfb74daa161f2344d98046e72c5025b5ae1c7 SHA-256: ff9adc4608dcaea95871a56cbe689681e40c9eee184e5d695a5488eac20fcf48
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://netsecure.top/app/431946152/free-jake-paul-merch-roblox-game-hack PDF link annotation
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-november-2021-hacks.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/get-free-robux-on-roblox-with-coputer.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/hacked-noob-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-robux-for-free-on-pc.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-get-free-roblox-codes-2021-may-sunny-hollow.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/getbux-me-free-robux.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/how-to-hack-granny-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/money-cheat-retail-tycoon-roblox.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-denisdaily-free-robux.pdfIn PDF document text
    • https://sitecontabil.com.br/ckfinder/userfiles/files/roblox-free-robux-hack-youtube.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_003_off00004070.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4070 26116 bytes
SHA-256: 3971bb4766ff01f9a0200ded498aa58682589f4dcdf38eaf1f3474b594fcb360
font_01_sfnt_off00007b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B93 19168 bytes
SHA-256: f1994a9307f535f095f0e9104e1c2c65231ef211478aec69bb75b6c7ff1b9a7f

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