Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef35a7efc9ae5a2d…

MALICIOUS

PDF

34.2 KB Created: 2021-07-01 18:50:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f9309ff2514351ced934b118b8c514cc SHA-1: 77d0fb6a159254991b9f2bcfd459f639acce54d3 SHA-256: ef35a7efc9ae5a2d9eeb5b7ab2bb68b5f149805e62af73dd0453b01cc7dfe1c7
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains numerous embedded URLs and a "link farm" heuristic firing, suggesting it is designed to redirect users to external sites. The document body and extracted URLs indicate a lure for game cheats and hacks, likely to trick users into downloading malware. The ML classifier strongly supports the malicious nature of this PDF.

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-bee-swarm-honey-hack-game-hack
    • http://pustaka.mesin.ft.unand.ac.id/repository/roblox-how-to-hack-groups_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-free-money-in-jailbreak-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-hack-someone-on-roblox-with-google-chrome_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-free-stuff-roblox-2021_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/cruise-ship-tycoon-cheats-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/download-hack-tool-for-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-free-robux-generator_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-root-hack_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/roblox-cheat-free-download_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-to-get-robux-for-free-2021_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/free-robux-generator-no-human-verification_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-spin-blogspot_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/earn-free-robux_GM431946152.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-free-coins-generator_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/coin-master-gift-link_GM406889139.pdf
    • http://pustaka.mesin.ft.unand.ac.id/repository/xxlolaplaysxd-free-robux-help_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e4e.bin
ec6603412d7258902cc07510ea52c23620db14744efc3a2c62a7ee1f1b9fccde		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E4E 22348 bytes
font_01_sfnt_off00005fbb.bin
273a3a901ac711418f030b2634e6448537c9a033ac83123a89196b79c08f1f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBB 19260 bytes

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