Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e007c262e183ee5…

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 15:05:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: bcf8a9651ba5c0ebfbd8645befad0de3 SHA-1: b88f77899aebc5e641a674a9ff1e3b61ebf39953 SHA-256: 1e007c262e183ee52416689e422a69523b088bc3670a4966a69a01876323254d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links to external resources, many of which are presented as game hacks or cheats. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. The document likely serves as a lure to download further malicious content or visit phishing sites.

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/freespinandcoinblogspot-com-2021-11-coinmasterfreespins-game-hack
    • https://vireco.store/ckfinder/userfiles/files/hacks-master-coin_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/haw-to-get-free-robux-obbys-2021_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/http-bit-ly-coin-master-hack_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-mod-apk-latest-hack-with-unlimited-free-spins_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-shield-link_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/money-hack-roblox-jailbreak-download_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/get-free-robux-pastebin_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-hats-roblox-2021-unpatched-urban420-network_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/oprewards-free-robux_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/spin-free-coin-master_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/real-minecraft-for-free_GM479516143.pdf
    • https://vireco.store/ckfinder/userfiles/files/roblox-how-to-get-any-gamepass-for-free_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/coin-master-free-raid-link_GM406889139.pdf
    • https://vireco.store/ckfinder/userfiles/files/free-robux-roblox-promo-codes_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/roblox-shopping-simulator-hack_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-robux-2021-working_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/hack-youtube-roblox-game_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/how-to-get-free-items-in-roblox-2021_GM431946152.pdf
    • https://vireco.store/ckfinder/userfiles/files/roblox-hack-generator_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off000031a6.bin
dc4f27661e0f25de961d9596f5fec59ef16d5268bff7e7059e8ecbab80c49a72
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31A6 23348 bytes
font_01_sfnt_off00006670.bin
4d79388b77b70e51239d224782561472d5aaa6f564ac5e1b9a8e71f2b8352f5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6670 19240 bytes