Malicious PDF — malware analysis report

Static analysis result for SHA-256 b671db0c24e75552…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 22:47:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 613ae6c1210aa742d494c022c4683998 SHA-1: 1b7d71e7d0f4ad8df61db61f1a315712eba713cb SHA-256: b671db0c24e7555253172325e3ed9a96cc204ff380b8d835cd427d1cb9e57465
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are SEO-optimized and point to sites offering 'free Robux' or game hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' lure reinforces the deceptive nature of the document. The primary attack pattern involves tricking users into visiting malicious websites that likely host further malware or phishing content.

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/free-robux-generator-for-kids-game-hack
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/links-to-get-free-coins-in-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verify_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-minecraft-skins-xbox-one_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/best-coin-master-hack_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/master-8-ball-pool-free-coins_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-robux-just-click_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/freerobux-hack-us_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-spin-coin-master-hacktoman_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-get-free-spins-coin-master_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/1x1x1x1-roblox-id_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/get-free-spins-on-coin-master-2021_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/roblox-no-download-hack_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/who-to-get-free-robux_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/is-there-a-free-version-of-minecraft_GM479516143.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/how-to-hack-coin-master-game-without-root_GM406889139.pdf
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/minecraft-diamond-finder-hack_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b63.bin
69625ac06a2ba6c3fab175db1f2cef6ddbb415cec49c4d1192e3a07bb66f97e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B63 24488 bytes
font_01_sfnt_off000083b1.bin
699ebd5d78640cc812bbb586150daa4d415ceda65572c7c56e250d7f18cab54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83B1 18640 bytes

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