Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b4932fb2bd4b51…

MALICIOUS

PDF

34.2 KB Created: 2021-06-30 08:47:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d862e1850a080ae0f01c3f8cb8cb2f7 SHA-1: 715193d5e5b8fecd2674105dfda826f33f52c666 SHA-256: c4b4932fb2bd4b51c556dc18474efb5f9ac9e31330e852c21bff5cd7adc7d541
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 hosted on the same domain and appear to be part of a link farm. The document body and extracted URLs suggest a lure for users seeking game cheats and free in-game currency, such as for Roblox and Coin Master. The presence of a 'download button' heuristic further supports the malicious intent of directing users to download potentially harmful files.

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/roblox-games-that-give-free-items-game-hack
    • https://fib.ub.ac.id/sac/repository/mcpe-master-unlimited-coins-free-download_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-app-link_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/pne-hit-kill-hack-in-jailbreak-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-elemental-battlegrounds-speed-hack_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/robux-in_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/wurst-client-download_GM479516143.pdf
    • https://fib.ub.ac.id/sac/repository/hack-para-coin-master-singapore_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-hack-space_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-como-tener-robux-gratis-sin-hacks_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/minecraft-skins-download-free_GM479516143.pdf
    • https://fib.ub.ac.id/sac//repository/daily-coin-master-link_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-free-spin-and-coin-link-app_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-free-accounts-and-passwords_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/free-robux-instantly_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-roblox-keyloggers-v3rmillion_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-bucks-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-without-verification-2021_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-get-free-skins-in-minecraft_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002d93.bin
d84a57fcaab215d604642f938b955e5ecd25b1f3954902764f05a5a2958f3228
pdf-font-stream PDF embedded font (sfnt) at offset 0x2D93 22380 bytes
font_01_sfnt_off00005f7d.bin
9bb3327cf44d62931e833a0b1cfa854a8e812c31bea22411c75fd4b183356b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F7D 19412 bytes