Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a9cb3fbff31725a…

MALICIOUS

PDF

38.5 KB Created: 2021-05-21 14:53:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d28ca7dc76dce4dd8426f2762f935bdf SHA-1: eb24266fd69e404a082b890ed34e57f78cc151e2 SHA-256: 5a9cb3fbff31725a18fe4c71f456597161b52d1d2819e5eb12e8fccd362d7715
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF document contains a fake CAPTCHA lure, aiming to trick the user into clicking a link to download a "Roblox generator". The embedded URL and other extracted URLs point to potentially malicious content. While no scripts were explicitly extracted, the presence of a fake CAPTCHA and external links strongly suggests a social engineering attack to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8060

Heuristics 4

  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/javascript-free-robux-game-hack PDF link annotation
    • http://hilro.co.za/images/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/synapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://hilro.co.za/images/free-spin-coin-master-hack-2021_GM406889139.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_002_off0000316e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x316E 24364 bytes
SHA-256: 567173a7a08e9b2fb27950deb3e87cdf3262653b7c9ac00ce8849e566af82a4f
font_01_sfnt_off000068fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off000072af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72AF 18920 bytes
SHA-256: 37df68cbe6d620a6a908579d98e7a1ce8a765682fff888c408a64c9cb805dd83

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