Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04ba7d50d79e1d4…

MALICIOUS

PDF

33.6 KB Created: 2021-07-04 08:48:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: b37bf34585cd6a60a8d5a34750acee43 SHA-1: 41c28b51eba0d0af0e075ecf6af2cd7e67a64b29 SHA-256: c04ba7d50d79e1d49d53c04dc537d95f805966314a3d7d36ccd6d0d92c63dff0
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document is classified as malicious due to its structure, which includes a large number of external links pointing to SEO-optimized PDF files. The primary URL, http://netcdn.tw/app/479516143/free-minecraft-mods-game-hack, suggests a lure for downloading game cheats or mods. The presence of a visual download button further supports the deceptive nature of the document.

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.tw/app/479516143/free-minecraft-mods-game-hack
    • https://www.toyogas.com.tw/upload/files/coin-master-free-spin-link-today-2021_GM406889139.pdf
    • https://www.toyogas.com.tw/upload/files/how-to-make-clothes-for-free-in-roblox_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/comment-telecharger-un-logiciel-de-hack-dur-roblox_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/ninja-legends-hack-roblox_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/how-to-hack-pubg-mobile-unlimited-uc-without-human-verification_GM1330123889.pdf
    • https://www.toyogas.com.tw/upload/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://www.toyogas.com.tw/upload/files/roblox-hacked-version-download_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-roblox-hair_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/hacked-roblox-game_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/how-to-get-free-robux-for-free_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/cool-free-roblox-outfit-2021_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdf
    • https://www.toyogas.com.tw/upload/files/roblox-upcoming-free-items_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/apphack-online-free-robux_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/www-roblox-cheat-us-limite_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/coin-master-spins_GM406889139.pdf
    • https://www.toyogas.com.tw/upload/files/there-are-secret-ways-of-getting-free-robux_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/www-free-robux-com_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/how-to-make-robux-for-free_GM431946152.pdf
    • https://www.toyogas.com.tw/upload/files/roblox-cbro-how-to-get-free-knife_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000030d8.bin
fb266423656bf516cfbce25612adc5c38aa65ae1ccd91fd95124c014f07170d0
pdf-font-stream PDF embedded font (sfnt) at offset 0x30D8 21940 bytes
font_01_sfnt_off00006113.bin
2b18abc752ea10ed32dff01632e9a279be12b5ed0daf6dc49bb119b305c6d31f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6113 18172 bytes