Malicious PDF — malware analysis report

Static analysis result for SHA-256 23f3c410152b43e0…

MALICIOUS

PDF

43.2 KB Created: 2021-05-16 19:09:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2203d1532f2c61c9039bec1d097ecb9e SHA-1: 0872a974bf829d4e0192260b2e0d639007098afe SHA-256: 23f3c410152b43e0ae5269048eb83a64b41b1a4fd6cc60c7c20dfdc49c573366
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one prominently featuring 'roblox-booga-booga-hack-game-hack', suggesting a lure for game cheats or exploits. The heuristic 'SE_SECURITY_BYPASS' indicates the document attempts to instruct the user to disable security software, a common tactic in malicious documents. While no scripts were explicitly extracted, the presence of embedded URIs and the security bypass heuristic strongly suggest an attempt to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 4

  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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-booga-booga-hack-game-hack
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coins-master_GM406889139.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/roblox-free-hair-boy_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/online-coin-master-hack-here_GM406889139.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-time-hack-2021_GM406889139.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-com_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/minecraft-toys-for-free_GM479516143.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-spins-coins-coin-master_GM406889139.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/minecraft-clipart-free_GM479516143.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-through-coin-pop_GM406889139.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdf
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-links-app_GM406889139.pdf
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/roblox-girl_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/minecraft-free-download-chromebook_GM479516143.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/change-roblox-username-free_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/como-conseguir-monedas-infinitas-y-tiradas-de-coin-master-hack_GM406889139.pdf
    • https://beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-free-robux_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/free-robux-with-no-verification_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/synapse-roblox-free_GM431946152.pdf
    • https://www.beestonprimaryschool.co.uk/admin/ckfinder/userfiles/files/coin-master-com_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cc5.bin
ec37507e896f3c7384632ff10595b899442dc7438bab8f51cd02779f4d037d3b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CC5 24748 bytes
font_01_sfnt_off000085fb.bin
8f2f52aff80fb49a328e063288f2b5e4f116517157d382fa8b39f5595cbe047c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FB 18468 bytes

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