Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d4f24ff1e00f2ea…

MALICIOUS

PDF

45.6 KB Created: 2021-06-13 17:31:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 25f656ca9f221824673adfd13cbeab44 SHA-1: b88a682ef9fb0cea15421453fa276509a5f35927 SHA-256: 9d4f24ff1e00f2ea213fe1ecccdef1b5fcb25daa248e361cdc79d7cb523e27ac
82 Risk Score

Malware Insights

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

The document presents a fake CAPTCHA and a 'Free Robux' lure, indicating a social engineering attempt to trick the user into downloading a malicious file. The embedded URL points to a potential payload, and the ML classifier strongly flagged the PDF as malicious. The document body contains obfuscated text and references to the malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 http://netcdn.co/app/431946152/free-robux-picture-game-hack
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-heaven-free-daily-spins_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-windows-10-hacked-client_GM479516143.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-hack-a-minecraft-server_GM479516143.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spins-link-iphone_GM406889139.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-hack-spins-ios_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/roblox-robux-hack-generator_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/moonactive-coin-master-hack_GM406889139.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/free-robux-without-any-verification_GM431946152.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/haktuts-coin-master-free-daily-spins_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-make-a-server-in-minecraft-java-for-free_GM479516143.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/free-robux-survey_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/free-spins-coin-master-facebook_GM406889139.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/static-moonactive-net-rewards_GM406889139.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-more-robux-for-free_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-bedrock-free-server-hosting_GM479516143.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/get-free-robux-now_GM431946152.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-levels_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-spins-coin-master-blogspot_GM406889139.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a5.bin
db6aef5c858a5677611ecf584b634f45288ff360a3c41d751e0fe7f5201eafe0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A5 27660 bytes
font_01_sfnt_off00008f53.bin
34b0e3a58c66b2af54b16d5c8d734c4555ce81663a4a6734022a64244545498a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F53 18392 bytes

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