Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3a75913a2bfc227…

MALICIOUS

PDF

37.3 KB Created: 2021-05-20 19:08:18 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 305eee5ad1a1cc74a6e302b3b7cea237 SHA-1: 0c9847d4b01668e2f248e2cf6cb502b9a3417977 SHA-256: c3a75913a2bfc22774ab095d302b470f0ca77ae39c50633af23a3711b6262ee3
82 Risk Score

Malware Insights

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

The sample is a PDF that displays a fake CAPTCHA or download button to trick the user into clicking a malicious link. The embedded link leads to another PDF hosted on a suspicious domain, likely intended to deliver a second-stage payload or further phishing content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9447

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-do-you-hack-roblox-game-hack
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/how-to-get-free-robux-as-a-kid_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdf
    • http://kdlscaffolding.co.uk/uploaded_files/userfiles/files/coin-master-free-spins-link-iphone_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003180.bin
9acc4f14924cb9d6654dcd7f10f623900c7913e7c3e1faa306f6726dfee22e4a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3180 27284 bytes
font_01_sfnt_off00006ea1.bin
d27b94fe1a8c05d6feb56d9a091a96145976f0feb7173cb46f16c8470fe3a7d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA1 18816 bytes

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