Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d35c579c8400869…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 17:05:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 59e382a1a90d5549487b3fc96a3af28c SHA-1: c8cd2e9e32c97eb9f0b7a944008ba2e8202caf95 SHA-256: 2d35c579c840086993be032590656633bfc5e44d840e568488414a55c907b24e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

The PDF contains numerous links to external resources, many of which are hosted on a compromised educational domain and point to game hacks and exploits. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document may attempt to execute commands, likely to download and run further payloads. The ML classifier also strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • 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/406889139/gamehunters-coin-master-game-hack
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/master-free-spin-and-coin-links-html-m-1_GM406889139.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-do-u-hack-roblox_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/installer-roblox-hacker-sur-pc_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-clothing-on-roblox_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-a-private-server-roblox_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/como-hackear-roblox-con-cmd_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-hack-into-someones-account-in-roblox_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-website_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/roblox-hacks-com_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/hacks-for-flora-frenzy-roblox_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-builders-club-on-roblox-2021_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/coin-master-spin-hack-pc_GM406889139.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-free-202100-robux_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/easy-robux-hack_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/how-to-get-minecraft-for-free-on-ps4-2021_GM479516143.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/robux-online-free_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/free-robux-without-any-verification_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/upload/ckeditor/files/wallbank-hack-roblox_GM431946152.pdf
    • https://is.itk.ac.id/asset/backend/uploa
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003296.bin
c032e1db0631510c43999226d4ad961c63a3a24ee51f36ec1e4cf95208661263		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3296 22564 bytes
font_01_sfnt_off00006503.bin
97a4497a5bee92c584e8116972a533ff4381ba251d0dec1f9487a3f459646ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6503 18400 bytes

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