Malicious PDF — malware analysis report

Static analysis result for SHA-256 8396f114637ef0e9…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 13:10:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3085dfaf9fe739d845bd7a641dec6711 SHA-1: 0b9506f8cbf179b62cfe8f7de1bbc55bba8b3fac SHA-256: 8396f114637ef0e90334153c425b7f212cf1d896c82ceeca8a6fb4ef634db05e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which are SEO-optimized and point to sites offering 'free Robux' or 'free spins' for games like Roblox and Coin Master. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate malicious intent. The primary URL suggests a lure for game-related cheats or hacks, likely leading to a phishing site or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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 https://netcdn.online/app/431946152/roblox-games-with-free-vip-servers-game-hack
    • http://library.ulb.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdf
    • http://library.ulb.ac.id//repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdf
    • http://library.ulb.ac.id/repository/hack-xp-net-generators-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id/repository/free-spins-and-coins-from-coin-master-game_GM406889139.pdf
    • http://library.ulb.ac.id//repository/coin-master-spin-hack_GM406889139.pdf
    • http://library.ulb.ac.id/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • http://library.ulb.ac.id//repository/minecraft-free-download-laptop_GM479516143.pdf
    • http://library.ulb.ac.id//repository/how-to-change-your-roblox-username-for-free_GM431946152.pdf
    • http://library.ulb.ac.id//repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdf
    • http://library.ulb.ac.id//repository/coin-master-free-shield-link_GM406889139.pdf
    • http://library.ulb.ac.id/repository/how-to-get-free-tiktok-coins_GM835599320.pdf
    • http://library.ulb.ac.id//repository/minecraft-free-online_GM479516143.pdf
    • http://library.ulb.ac.id/repository/coin-master-download-hack-ios_GM406889139.pdf
    • http://library.ulb.ac.id//repository/real-minecraft-for-free_GM479516143.pdf
    • http://library.ulb.ac.id//repository/roblox-free-robux-codes_GM431946152.pdf
    • http://library.ulb.ac.id/repository/free-coins-coin-master-today_GM406889139.pdf
    • http://library.ulb.ac.id//repository/hacker-minecraft-song_GM479516143.pdf
    • http://library.ulb.ac.id/repository/how-do-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://library.ulb.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdf
    • http://library.ulb.ac.id/repository/robux-offer-wall_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005439.bin
bb7b5dac5402cad5a08896719fcff9cfb676418f0cd0495161f134e063fefac6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5439 27208 bytes
font_01_sfnt_off000090e7.bin
7f710df973ea6b199c1d8a9eebfc78f33dea52488aae7810c2817cc78585c0c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E7 19448 bytes

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