Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34aac87c9de39ad…

MALICIOUS

PDF

34.7 KB Created: 2021-06-19 04:28:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4d3e4c753c543e965c48022ddd6124cf SHA-1: 6bac9a4a908cbfec33ffd949933b5baec4a5f526 SHA-256: d34aac87c9de39ad43bafb1a4e9b95e92e466edbe8e6a449790888e3ed653882
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded URLs and a DOC BODY that promotes 'free Robux' and 'game hacks', indicating a lure for users to download something. The PDF_SEO_LINK_FARM heuristic firing suggests a large number of external links were generated, likely to obscure the malicious intent and spread the lure across multiple domains. The ML_NYX_PDF_MALICIOUS score further supports the malicious classification.

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/get-a-robux-gift-card-online-free-game-hack
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-no-verification_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/roblox-games-that-give-you-free-robux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-jailbreak-money-hack-pastebin_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-spin-link-for-coin-master_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/roblox-tix-robux-hack-download_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-hack-in-roblox-jai_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/coin-master-hack-using-lucky-patcher_GM406889139.pdf
    • https://fib.ub.ac.id/sac//repository/free-robux-2021-no-human-verification_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/freerubux_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-no-offewrs_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-promocodes-working-on-roblox_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-minecraft-bedrock-server-hosting-24-7_GM479516143.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-with-no-human-verification_GM431946152.pdf
    • https://fib.ub.ac.id/sac/repository/free-minecraft-server-maker_GM479516143.pdf
    • https://fib.ub.ac.id/sac//repository/coin-master-game-hack_GM406889139.pdf
    • https://fib.ub.ac.id/sac/repository/free-robux-picture_GM431946152.pdf
    • https://fib.ub.ac.id/sac//repository/free-minecraft-skins-pe_GM479516143.pdf
    • https://fib.ub.ac.id/sac/repository/how-to-get-free-robux-easy_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee9.bin
168b69332a910eede1ce91adb3609d2a0ba112862743ca1a70c2546f55616b10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE9 22824 bytes
font_01_sfnt_off00006255.bin
522ef3fd9e0df9dbde30c4c337fa28be90ad08b94a5eb0632fa80b38df0c4398		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6255 19188 bytes

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