Malicious PDF — malware analysis report

Static analysis result for SHA-256 086367c81517a3e8…

MALICIOUS

PDF

34.8 KB Created: 2021-06-23 13:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 33e31c9714cab3bc8aeed67b43002754 SHA-1: abad99ac084d9623b13020d8734fca092dc5ed9e SHA-256: 086367c81517a3e838a4182ede9db92b2fde49129ff7417c295f59c1f35f3a91
102 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are structured as a link farm, pointing to resources related to game hacks and cheats. The document body and extracted URLs suggest a lure to download potentially malicious files disguised as game cheats. 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.co/app/431946152/roblox-hack-khol-admin-perm-game-hack PDF link annotation
    • https://silvterie.com.br/images/ckfinder/files/roblox-cheats-without-builders-club_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/roblox-hack-exploit-project-pokemon_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-hack-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-gear-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/robux-download_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/can-you-still-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-food-for-foxy-in-coin-master_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-synapse-key-roblox_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-free-spins-2021-apk_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/como-convertirse-en-hacker-en-roblox_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/how-to-get-free-robux-by-playing-games_GM431946152.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/http-appsmob-info-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • https://silvterie.com.br/images/ckfinder/files/minecraft-pe-hacks-ios_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3083 22480 bytes
SHA-256: 3c2851a7a5e8a3b66f0b831d34b2d60fa920fb7285275483c83189130a6cf009
font_01_sfnt_off000061ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61EE 19528 bytes
SHA-256: 4412f1ca52e9fefa677186f23582315af7bbe403810c8da55130fcdb943392c2