Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbfffd7b6b86af32…

MALICIOUS

PDF

33.1 KB Created: 2021-07-05 14:31:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1f6dc786734959d3c63dd4881515e24c SHA-1: 996df9029d4f73f20b3ea9dcc9995e68d384be6a SHA-256: bbfffd7b6b86af32c1f136140c7c68b0ee4d5a6afd82ccb6ed634916648c40f5
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized to appear as guides for obtaining in-game currency or cheats for popular games like Roblox and Coin Master. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the ML classifier strongly flagged this PDF as malicious. The primary URL, http://netcdn.tw/app/431946152/how-to-get-free-robux-on-android-game-hack, likely serves as the initial lure or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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/431946152/how-to-get-free-robux-on-android-game-hack
    • https://fib.ub.ac.id/sac/repository/how-to-sell-a-tshirt-for-free-on-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-app-free-download_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/free-spin-coin-master-2021-link_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-2021-generator_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-hack-me-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/ash-greninja-free-shopping-in-roblox-on-roblox-shopping-shir_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-mac-hacks-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/boku-no-roblox-infinite-spin-hack-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/bloxland-earn-free-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/what-is-a-minecraft-client_GM479516143.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-make-a-roblox-hack-gui-visual-studio_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-hacker-on-urbis_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/flamingo-skin-but-its-free-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-hack-mod-apk-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/minecraft-cheat-client_GM479516143.pdf
    • https://fib.ub.ac.id/sac//repository/is-pokemon-go-a-free-app_GM1094591345.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-host-a-minecraft-server-for-free_GM479516143.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-soins_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-boku-no-roblox-remastered-hack-script_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/parkour-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002aa7.bin
a1e4a51b0ff1d82243db741d39ddff3438263e3357181c25b01c73c2d8cfbdb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x2AA7 22152 bytes
font_01_sfnt_off00005c01.bin
b9c958d983b97f7968ab46997b490559e339ab7431e824395394db593a3c865b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C01 19280 bytes