Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbaeaec449a481…

MALICIOUS

PDF

42.3 KB Created: 2021-05-18 00:19:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e6a3c67a47730bff90759a0d54b7fe38 SHA-1: 1e387d671389a0935ea1c8a92941d7f9c2f9a293 SHA-256: b9dbaeaec449a4815485ca04a01670087efd65a369d0a45aca9880c60e4f5819
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are structured as SEO-optimized PDF slugs, indicating a link farm. The primary URL, 'https://netcdn.xyz/app/431946152/op-rewards-free-robux-game-hack', suggests a lure related to game rewards or hacks. The presence of numerous PDF links and the ML classifier's high confidence score point towards a malicious intent to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/op-rewards-free-robux-game-hack
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/online-coin-master-hack-here_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-tool-generator_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/minecraft-bedrock-for-free_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/roblox-promo-codes-free-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-coin-master-spin-hack_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-hack-to-get-free-spins_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-roblox-printables_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/roblox-account-taker_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-link_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-without-root_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/cool-minecraft-hacks_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/get-me-robux-for-free_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-minecraft-skins-ps4_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-coins-coin-master-link_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/coin-master-app-hack_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/get-free-robux-info_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/www-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_off00004a6b.bin
e5083e267da2e784cb4be70dcb1c233c338542b31b3d34b994ed475827c74e8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A6B 24496 bytes
font_01_sfnt_off0000812c.bin
060429e30aee9ae32e68a5a96a6a224aa27ea33c727993be362f9dfde6d66d3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 18756 bytes

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