Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a56e9d439d47db6…

MALICIOUS

PDF

34.1 KB Created: 2021-07-02 05:38:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 34be94db0c38ce59ff30b36823a12e7b SHA-1: 3ecb934dfc5bff6a2a222f8b22c2f4771b369750 SHA-256: 1a56e9d439d47db6a5e2942b2119d70d50578c92e5825a27f8eed7f8dff08555
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on university domains but appear to be part of a link farm promoting game hacks and cheats. The ML classifier and PDF heuristics strongly indicate malicious intent, likely to direct users to malicious sites for downloading malware or engaging in phishing. The presence of a 'download button' lure further supports this conclusion.

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/ban-roblox-pour-avoir-hacker-des-robux-game-hack
    • https://pasca.unisba.ac.id/elibrary/repository/hack-coins-in-coin-master_GM406889139.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-cheat-engine-lua-scripts_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-running-gamepass-parkour-roblox_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/how-to-get-free-mods-in-minecraft_GM479516143.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-hacker-us_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/mega-robux-hack_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/buy-my-free-roblox-clothes_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-cheats-card_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-now-2021_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/robux-maniac-free-robux-on-web-site_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/roblox-high-school-life-hack_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/all-of-the-free-roblox-hats_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-only-1-step_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-robux-codes-no-verification-2021_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/free-roblox-credit-card_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/hack-para-volar-en-roblox-2021_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/what-is-the-best-roblox-hack-youtuber_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/site-17-hack-roblox_GM431946152.pdf
    • https://pasca.unisba.ac.id/elibrary/repository/image-hacker-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002df0.bin
21032d12a5d0d4967331bc608b07e2c52cd6c61c73c34022ff7fbcb9ca9c6e16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DF0 22176 bytes
font_01_sfnt_off00005f3b.bin
52cb06649e8c8b1a796debc690aa33c56c3b34711fce83f89a864473c5a99aa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3B 19352 bytes

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