Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3ea5b9071863dd…

MALICIOUS

PDF

49.3 KB Created: 2021-05-15 10:33:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d22cb32d568eedab09b00fd265a627b5 SHA-1: ac7af0cf7661765b9a4977d7c31879a888fa7759 SHA-256: 5b3ea5b9071863ddc8ac70944f266b1e8323adb4b9b456de865e609008665baf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs and a heuristic firing for an external URI, indicating it is designed to redirect the user to download a payload. The document body, though heavily obfuscated, contains references to 'Roblox' and 'free robux', suggesting a lure for game-related cheats or hacks. The presence of a 'Password-protected archive handoff' heuristic further suggests that the downloaded content may be encrypted, intended to bypass security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/roblox-18-game-hack
    • http://onlinemusicsolutions.com.au/images/get-free-robux_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/free-robux-live_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/coin-master-free-spins-link-today_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/free-spins-and-coins-from-coin-master-game_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdf
    • http://onlinemusicsolutions.com.au/images/minecraft-pe-texture-packs-free-download_GM479516143.pdf
    • http://onlinemusicsolutions.com.au/images/free-coins--spins-coin-master_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/free-robux-that-actually-works_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/coin-master-free-spins-deutsch-download-2021-link_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/microsoft-store-robux_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/how-to-make-a-modded-minecraft-server-for-free_GM479516143.pdf
    • http://onlinemusicsolutions.com.au/images/coin-master-free-spins-2021_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/robux-hack-free-robux_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/roblox-free-robux-hack_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/get-free-robux-today_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/do-coin-master-hacks-work_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/free-robux-accounts-2021_GM431946152.pdf
    • http://onlinemusicsolutions.com.au/images/how-to-get-free-pet-food-on-coin-master_GM406889139.pdf
    • http://onlinemusicsolutions.com.au/images/minecraft-for-free-games_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd5.bin
05e3368250bf18da86da1e587dadfc99411ad056b7fd0366d4f365701c97f6c8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD5 38564 bytes
font_01_sfnt_off00009f8b.bin
b4983712f09b148f8a8b45296f8ff968c6e941a598ef477ab36d5db1dcb352e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F8B 18100 bytes

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