Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e503ec9565a9264…

MALICIOUS

PDF

36.4 KB Created: 2021-07-04 16:08:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 07d9505c5dccacad516e14041315acdb SHA-1: 723eb80a936e7009daee0a3e8b0e20bc165c6c90 SHA-256: 7e503ec9565a926452c8a65431749c7ab09505ab4cc4413c75805db3f7d03679
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to host SEO-optimized PDF files. One prominent URL, http://netcdn.tw/app/406889139/coin-master-hack-app-ios-game-hack, suggests a lure for downloading a game hack application. The ML classifier also strongly indicated maliciousness.

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.tw/app/406889139/coin-master-hack-app-ios-game-hack
    • http://winnerwater.com.tw/image/data/files/free-catalog-stuff-in-roblox-2021_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux-2021_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/how-to-hack-someones-account-on-roblox_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/how-to-get-gold-cards-on-coin-master-hack_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/cheat-codes-for-adopt-me-roblox_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/spin-links-for-coin-master_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-links-that-don-t-expire_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/free-roblox-serverside_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/free-robux-giveaway_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/roblox-how-to-get-clothes-for-free_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/roblox-admin-hack_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/free-coins-coin-master-hack_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/free-pokemon-brick-bronze-beta-roblox-wiki_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/is-minecraft-bedrock-edition-free_GM479516143.pdf
    • http://winnerwater.com.tw/image/data/files/free-nerd-glasses-roblox_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/dragon-ball-final-stand-roblox-hack_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/80-free-spins-coin-master_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/roblox-hack-no-download-no-survey-no-password_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003959.bin
f7a3477abdece413ad6b126272e9a112dd3bded15e926a79af96a81c990abcd4
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3959 22732 bytes
font_01_sfnt_off00006c02.bin
669191ced257cad8cf719fd096a029eb32cc90bb1eacba4ce7ed61202962bed4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C02 18180 bytes