Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6939431b638f535…

MALICIOUS

PDF

34.3 KB Created: 2021-07-06 02:11:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e5bf897ca265a1c7fcd97b5cef22dbc9 SHA-1: 577731b407471fb0ac2b89a1eb399e1dcbf03631 SHA-256: c6939431b638f5352ab1203b65543234ffc8a4398f7aaf6246922cc21e3bb72c
82 Risk Score

Malware Insights

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

The PDF document contains numerous URLs and text referencing game hacks and cheats, aiming to trick users into downloading malicious content. The presence of 'cmd_GM431946152.pdf' and the external URI heuristic strongly suggest the execution of commands or a second-stage payload. While no scripts were explicitly extracted, the ML classifier and heuristic firings indicate a high likelihood of malicious intent, possibly involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.tw/app/431946152/roblox-hack-download-game-hack
    • http://stomatoloska-ordinacija-rijeka.com/files/barren-cheats-roblox_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/roblox-weird_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/free-robux-reddit_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-freebies_GM406889139.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/coinmaster-blogspot_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/cheat-codes-for-prison-escape-simulator-roblox_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-xbox-one-code-free_GM479516143.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-get-a-free-minecraft-account_GM479516143.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/gravity-roblox-hack_GM431946152.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/can-you-really-hack-coin-master-ios_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/robuxy-com-free-robux_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/roblox-speed-hack-2021-download_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-java-free-trial_GM479516143.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/minecraft-pocket-edition-free_GM479516143.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-hack-accounts-on-roblox-with-cmd_GM431946152.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spin-and-coins-links-home_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/coin-master-free-spins-link-today_GM406889139.pdf
    • https://www.stomatoloska-ordinacija-rijeka.com/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/how-to-get-free-robux-with-code_GM431946152.pdf
    • http://stomatoloska-ordinacija-rijeka.com/files/hacks-for-murder-mystery-2-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030bf.bin
b3502617f90cf8214f6cfdba75f88d15abcac2fbcdbe82ab9defc62c63510e1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30BF 21684 bytes
font_01_sfnt_off0000607b.bin
20e8ef43e122870d61f5f3bdc7785651657b4c6f8223466300bbb50b4def8f00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607B 19160 bytes

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