Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc2c167f8e43820e…

MALICIOUS

PDF

34.8 KB Created: 2021-06-20 23:38:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 01f3713efd66a950cdd9d13c69dc3cf0 SHA-1: c9543c480b43c6fe10b1b2cb23861523e75d5aec SHA-256: bc2c167f8e43820e9d46c96f76ae112f989d9cf7b72118eee9e1ccd7b6c11005
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 'berkahjayamulia.com' and appear to be part of a link farm designed to attract users searching for game cheats and free in-game items. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, and the ML classifier strongly suggests malicious intent. The document body, though partially garbled, contains references to game-related terms and URLs, reinforcing the lure.

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/is-roblox-studio-free-game-hack
    • https://berkahjayamulia.com/ckfinder/userfiles/files/get-robux-today_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-daily-spins-coin-master_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/how-to-get-free-shirts-on-roblox_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-tiktok-followers-quick-and-easy_GM835599320.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/robux-earning-websites_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-24-7-minecraft-server_GM479516143.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-hack-without-downloading-apps_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-roblox-card-codes-2021-not-used_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/how-to-get-free-robux-on-bux-gg_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-spins-coin-master-facebook_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/free-robux-no-verification-no-download_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-game-hack_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/hack-coin-master-android-game_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/i-got-hacked-on-roblox_GM431946152.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-online-hack-no-survey-no-password_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-free-coins-links-2021_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/freespins-coin-master_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/coin-master-event-hack_GM406889139.pdf
    • https://berkahjayamulia.com/ckfinder/userfiles/files/rich-free-roblox-accounts_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003057.bin
16877cc1737b7c8ed7346ef509c882891fb80bf0506bcdba33c9f66e783aa19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3057 22504 bytes
font_01_sfnt_off00006298.bin
5b1de23626d81aaf99a279195b00efdf905ea81811442041bbbefcdac3d0aa36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6298 19188 bytes

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