Malicious PDF — malware analysis report

Static analysis result for SHA-256 927838f7e0140ae4…

MALICIOUS

PDF

33.6 KB Created: 2021-06-21 09:16:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 22e4c8d900d59e80e57aa0a9c57e953e SHA-1: e1e246136bf0b8c471253dc45801f30059bec568 SHA-256: 927838f7e0140ae4a93d2c4902222524079049a8f5e379e562d250b4870511ec
102 Risk Score

Malware Insights

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

This PDF document contains numerous links to external resources, many of which are related to game hacks and cheats, suggesting a lure for users to download potentially unwanted or malicious software. The presence of a 'download button' heuristic further supports this, indicating a deceptive user interface. The ML classifier strongly flagged this PDF as malicious, and the primary malicious URL identified is http://netcdn.co/app/406889139/free-pet-snacks-coin-master-game-hack.

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.co/app/406889139/free-pet-snacks-coin-master-game-hack
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-time-hack_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/can-i-get-minecraft-for-free_GM479516143.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/archery-master-3d-coins-hack_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-to-play-minecraft-servers_GM479516143.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-pet-snacks-coin-master_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/give-me-robux_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-clothes_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-vip-server_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-cards_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-2021_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-app_GM406889139.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-roebucks_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/hacked-roblox-accounts-list_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-free-item-codes_GM431946152.pdf
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-reddit_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002eb7.bin
7660a4e5b0625bd9dbe552bad0c4bee8287a646281830478b220afaa4f55e153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EB7 22380 bytes
font_01_sfnt_off000060a2.bin
0e857b887b57b449fb703f00816ed5f053300a0f83deba051c228f68feb6ecb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60A2 18320 bytes

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