Malicious PDF — malware analysis report

Static analysis result for SHA-256 57df4b32ba7df80c…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 09:41:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 554a71b2cadb6c6e2d23724e5739141d SHA-1: a244fb9c034ee555f8add0c6652be29016dd08b6 SHA-256: 57df4b32ba7df80c4c720e061181340517caa90b5aed71b72b13a8f3205c4c2e
102 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links to external websites, many of which are structured as SEO-optimized PDF links. The primary URL and many others point to resources promising 'free followers', 'hacks', or 'free currency' for games like TikTok, Minecraft, and Roblox. This suggests a social engineering lure designed to trick users into visiting malicious sites or downloading further malware. The ML classifier also strongly indicated maliciousness.

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/835599320/get-free-tiktok-followers-app-game-hack
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/tiktok-free-hearts-hack_GM835599320.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/minecraft-launcher-free_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/new-free-money-links-coin-master_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-spins-coin-master-links-blogspot_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-to-get-free-cards-for-coin-master_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-how-to-hack-robux-with-cheat-engine-64-2021_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/bed-hacks-on-bloxburg-roblox_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/bloxland-earn-free-robux_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/robux-game-com_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/hack-roblox-pc-download-no-clips_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/free-minecraft-server-hosting_GM479516143.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/cm-daily-spins_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-redeem-card-codes-free_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-hacks-that-actually-work_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/coin-master-game-hack-version-download_GM406889139.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-call-of-robloxia-5-cheats_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-brick-cars-cheat-codes_GM431946152.pdf
    • https://elma.mtsn8jkt.net/__statics/gudangsoal/files/roblox-com-robux_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002faa.bin
aa4ea886637c9c62bed970cb2ac5971b408c640a27c539312ac4fc2c94427164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2FAA 23076 bytes
font_01_sfnt_off000063c8.bin
82df1cb231dda94694ff565a9c5f97ede52b6b7a920c4303b5e0bfa5105fd647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C8 18388 bytes

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