Malicious PDF — malware analysis report

Static analysis result for SHA-256 639a3599895a34d8…

MALICIOUS

PDF

35.3 KB Created: 2021-07-01 05:17:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d271ff1f88c40c282ee25ee78aace993 SHA-1: b14a5b3116496deeec167d937cfe26bd05c12b94 SHA-256: 639a3599895a34d8a96a450bb4eefb1aab6e152e20b233eed78ec23b3d922942
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body that explicitly advertises 'free' in-game items and hacks for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier strongly suggests maliciousness. The primary URL, http://netcdn.co/app/431946152/roblox-free-obc-card-codes-game-hack, is likely a landing page for a malicious download or exploit.

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-obc-card-codes-game-hack
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-2021-free-spins_GM406889139.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/hack-money-roblox-lumber-tycoon-2_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/script-roblox-hack-2021-notepad-script-pack_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/pokemon-go-free-rare-candy_GM1094591345.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-android_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/coin-master-hack-without-verification-code_GM406889139.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/roblox-com-free-robux-obby_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/how-to-hack-roblox-dungeon-quest_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-clothes-on-roblox-2021_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/poisonous-beast-mode-free-roblox_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/spin-rewards-coin-master_GM406889139.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/minecraft-pocket-edition-free-ios_GM479516143.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-coin-master-spins-2021_GM406889139.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-roblox-hair-codes_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-roblox-money-cheats_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-without-any-verification_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/roblox-how-to-get-free-bc-tbc-obc_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-robux-all-need-is-user-name_GM431946152.pdf
    • https://marstechmedical.com/uploaded_files/userfiles/files/free-tiktok-followers-no-downloads_GM835599320.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003495.bin
f48dc35e2cea433d13c2e3192ec6e9ff98963e40fcf7875ad28a60c68122a8a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3495 22172 bytes
font_01_sfnt_off000065d4.bin
ccb9f4ede60d1354150f8094900c77066bb6f79c6791658bb0717d2d626093e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D4 18824 bytes

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