Malicious PDF — malware analysis report

Static analysis result for SHA-256 238983ee3397e3c0…

MALICIOUS

PDF

35.7 KB Created: 2021-06-26 20:30:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: f305e99c2ce5b93f3793f9f7fa5c9816 SHA-1: 030ed11dad697fb89c383b89775fda66fe8b5498 SHA-256: 238983ee3397e3c00cf67cfde12acefb2fd5d5fc7d88fa7ecf40003995919520
102 Risk Score

Malware Insights

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

The PDF contains numerous embedded links and a document body that promotes game cheats and hacks, indicating a lure for users to download potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm heuristic further supports its malicious intent. The primary goal appears to be directing users to external sites via these links.

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-free-play-login-game-hack
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-daily-free-cards_GM406889139.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-hack-roblox-jailbreak_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-groups-2021_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-make-a-minecraft-server-for-free_GM479516143.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-today_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/hack-mod-apk-de-roblox-2_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/coin-master-free-spins-generator-no-verification_GM406889139.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-obc-and-robux-pastebin_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/roblox-free-script-for-part_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/generator-robux_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/unlimited-coin-master-free-spins_GM406889139.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/links-for-coin-master-free-spins_GM406889139.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-robux-by-playing-games_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/toolbox-for-minecraft-pe_GM479516143.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/easy-roblox-today_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/free-robux-mobile_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/how-to-get-free-robux-2021-no-suvey-n0-human_GM431946152.pdf
    • http://www.vvsautomaticdoors.com/uploaded_files/userfiles/files/roblox-free-robux-easy-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_off0000324f.bin
177b0eec0f917d094b1567e448dca80a69efe507f0a7767474ca474f9d38cf35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x324F 23108 bytes
font_01_sfnt_off00006657.bin
a81290aa67b7fbbceb46905e46b227e907943cf56f5261930ada06739370a815		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6657 19104 bytes

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