Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb01dd49a697e82…

MALICIOUS

PDF

43.2 KB Created: 2021-04-25 13:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5e5e41913397d889863c4fc31c89edac SHA-1: 3566090eaffa2e4a14ce9e453c0586855fe84cf8 SHA-256: cfb01dd49a697e828ab62ca6b0ed3e4b1ceedbb575bb034588a3b3c537d708f6
82 Risk Score

Malware Insights

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

The sample was flagged by an ML classifier and exhibits characteristics of a fake CAPTCHA lure, designed to trick users into clicking malicious links. The document body and embedded URLs suggest a theme of hacking or obtaining free items, likely as a pretext to deliver a second-stage payload via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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/how-to-hack-roblox-and-get-free-stuff-game-hack
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-code-redeem-free.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-how-to-hack-apocalypse-rising-2021.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-cheat-gdn.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey-no-offer.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-hack-2021-pc-download.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-apk-hack.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free-robux-tix-bc-co-cc.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/robux-hack-2021-febuary-11.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/roblox-give-free-reedeem-card-pin.pdf
    • https://sf.nationalbreedingcenter.bz/ckfinder/userfiles/files/free4mobile-free-robux.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004233.bin
d61166023c34cf491bd1f14e255a8c3b81d47ce5bff0329c43b112589a9faf30		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4233 30636 bytes
font_01_sfnt_off00008521.bin
4d8f925ec21306cdb2a8a936cd8fe7dd6110b95577e243bc66a0edca80ddc74d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8521 18928 bytes

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