Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4b6e40904b5e286…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 15:56:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 76e25248d645ab8077ed7f5a2acca331 SHA-1: ee8138318bdd3322cdc9c1fdea0ef2447e43f9be SHA-256: f4b6e40904b5e28650d5bd8aed7f322582da9d9fcb2fc56b79f0f90d0364f516
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs and a prominent external URI pointing to sites offering 'free Robux' or game hacks. The 'PDF_SEO_LINK_FARM' heuristic indicates a large number of these links, suggesting a tactic to distribute malicious content or phish for credentials. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/how-to-get-free-robux-easy-game-hack
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-in-cheat-ingine-work-in-pizza-place_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-dentist-game-online-free-no-download_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-avatar-com_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-hack-tool_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-java-edition-free-download-for-android_GM479516143.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-games-no-downloads-2021_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-color-name-hack_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/welcome-to-roblox-building-hack_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/pastebin-free-obc-roblox_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-hacker-us_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-spins-on-coin-master-ios_GM406889139.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/gun-giver-script-lua-hack-roblox_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-free-download-google-play_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-cheat-sheet_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/free-spins-coin-master-app_GM406889139.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/wurst-112-2_GM479516143.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/ok-google-how-to-get-free-robux_GM431946152.pdf
    • https://me.itk.ac.id/asset/backend/upload/ckeditor/files/links-to-get-free-coins-in-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030df.bin
1f3706591404b0a2507e44062230f70f23e6f1c0eb00b7b67c996139ec7c994f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x30DF 21492 bytes
font_01_sfnt_off00005fd3.bin
0d91da27a3fd2071a1294b90674c0de4394c4ddf99a76a86a264892d4088a75d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FD3 19164 bytes

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