Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa0a515dc73d740…

MALICIOUS

PDF

45.3 KB Created: 2021-05-15 12:43:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 76d280388ef8cb897a1e32feb9e76715 SHA-1: 649e4ec49239de50f7aa36dbd839e7464c406812 SHA-256: 7aa0a515dc73d74048117f62a307c323b37a297f6d1c6b9f2fe4c72955cff5e4
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document that displays a fake CAPTCHA or human verification prompt, a common lure to trick users into clicking malicious links. The embedded URL points to a suspicious domain associated with game hacks, further indicating a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/rblx-city-free-robux-game-hack
    • http://www.thalanghospital.go.th/UserFiles/File/free-spin-coin-master-online_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/hack-coin-master-iphone_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/cool-free-roblox-outfits_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-master_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-hack-roblox-for-robux_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-human-verification_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-apk-33-download_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-spins-coin-master-2021-today_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-earn-robux-for-free-2021_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-mod-apk_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/orewards-com-free-robux_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/how-to-make-a-roblox-group-for-free_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-apk-with-fb-login_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-hacks-no-verification_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/mcpe-download_GM479516143.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-robux-link_GM431946152.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/free-links-coin-master_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/static-moonactive-net-link_GM406889139.pdf
    • http://www.thalanghospital.go.th/UserFiles/File/coin-master-hack-activegamer_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ad2.bin
c113195a8cc34268996957beeb91c9d07bf1e20af67746fe0a1a9379d43ed41f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AD2 29452 bytes
font_01_sfnt_off00008e37.bin
8c36c54b235ee774b4288e3a660071bec0b4f54d4ae0ca28de0be66b92090129		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E37 18492 bytes

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