Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdf473bb04593809…

MALICIOUS

PDF

39.9 KB Created: 2021-05-22 20:06:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2b6c8074d8484f2b8b179828f556da18 SHA-1: c8ed586164a700bd45a70a6ae03056a17024124c SHA-256: cdf473bb04593809f72c8ee75046f534ee7d606eed637a6ef24ce8bcec29ea74
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains text and embedded URLs related to 'Free Robux Generator' and 'No Human Verification', which is a common lure for scams. The presence of a fake CAPTCHA heuristic and a visual download button lure further supports this. The document directs users to external URLs, one of which is a known malicious domain, suggesting an attempt to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9476

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/free-robux-generator-no-human-verification-2021-game-hack
    • http://uniman.ch/images/robux-hack-2021_GM431946152.pdf
    • http://uniman.ch/images/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://uniman.ch/images/pubg-uc-jarir_GM1330123889.pdf
    • http://uniman.ch/images/coin-master-hack-game-download_GM406889139.pdf
    • http://uniman.ch/images/how-to-hack-roblox-accounts_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003447.bin
75eb0a16aead4854911bfadf77be4f7ae0ca417c9600382bf5d0b1a3f4215dac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3447 28732 bytes
font_01_sfnt_off00007814.bin
cfeb00e99c7da41c79bd6814c2de1bf58f441159bdfe452787b9448ffd27beb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7814 19260 bytes

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