Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df4351ba2c47339…

MALICIOUS

PDF

34.4 KB Created: 2021-06-26 11:23:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 2d45962c00ad79b93985505ec0ac81e6 SHA-1: e87f37070e9af9d5f494e1efac9fe5ae88fba3d6 SHA-256: 4df4351ba2c47339db61f206513b7255fb49b0fbf58766be508a77fa866d56d8
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 websites, many of which are structured as SEO link farms. The document body and extracted URLs suggest a lure for free in-game currency or items, likely leading to malware downloads or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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/431946152/how-to-get-robux-easily-for-free-game-hack
    • https://www.armera.co.uk/uploads/files/files/how-to-get-free-robux-builders-club_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/roblox-bux-free_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/clip60-upload-avxiy74olhs-get-free-pants-roblox-2021_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/free-minecraft-skins-xbox-one_GM479516143.pdf
    • https://www.armera.co.uk/uploads/files/files/site-roblox-hack_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • https://www.armera.co.uk/uploads/files/files/roblox-vehicle-simulator-shakedown-hack-glitch_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/roblox-how-to-use-cheat-engine-for-robux_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdf
    • https://www.armera.co.uk/uploads/files/files/free-spins-coin-master-app_GM406889139.pdf
    • https://www.armera.co.uk/uploads/files/files/spins-for-coin-master_GM406889139.pdf
    • https://www.armera.co.uk/uploads/files/files/minecraft-tools_GM479516143.pdf
    • https://www.armera.co.uk/uploads/files/files/free-links-coin-master_GM406889139.pdf
    • https://www.armera.co.uk/uploads/files/files/roblox-creepypasta-april-fools-hack_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/undetected-cheat-engine-for-roblox_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/games-that-gives-free-robux-2021-july_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/free-robux-place_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/hack-to-beome-supertall-in-roblox_GM431946152.pdf
    • https://www.armera.co.uk/uploads/files/files/coin-master-hack-version-download-ios_GM406889139.pdf
    • https://www.armera.co.uk/uploads/files/files/rbxfree-com-free-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002fe9.bin
279462824e10175b498cf9a3691168506aca11450f9cf82e04ed4ee4afc739f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE9 22008 bytes
font_01_sfnt_off0000608a.bin
f1ffc7d2e82a82b24f1806130f3f5b40a7237eb59bbd62277f33b30a843247e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x608A 19356 bytes