Malicious PDF — malware analysis report

Static analysis result for SHA-256 8902ad685d6948fd…

MALICIOUS

PDF

35.9 KB Created: 2021-06-18 14:04:30 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ca2bf0521b3206436035d75a0267f177 SHA-1: 74a5416d36b1eb81a17db59cff5758798678611f SHA-256: 8902ad685d6948fd7994e16425ffba240721c185a086b316c9a191574123fd29
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files offering game-related cheats and hacks. This pattern suggests a link farm designed to lure users into downloading potentially malicious content. 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/cache-http-fr.theperfectria.com-wirr-real-free-robux-codes.html-game-hack
    • http://www.romento.com/uploaded_files/userfiles/files/free-no-human-verification-robux_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-pics_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/free-mojang-account-with-minecraft_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-free-spins-link-october-2021_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-hack-2021-without-human-verification_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-hack-apk-download_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-hack-android-root_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-hack-pro_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/reborn-roblox-hack_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/minecraft-free-minecoins_GM479516143.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-invite-friends-hack_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/pubg-uc-app-download_GM1330123889.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/roblox-free-online-game_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/royalty-free-music-one-roblox_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-hack-tool-no-survey_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/buy-robux-free_GM431946152.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/coin-master-hack-app-for-ios_GM406889139.pdf
    • http://www.romento.com/uploaded_files/userfiles/files/level-coin_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000031cb.bin
20c2818dd60ded40b60fadd3e888cb48a20363658b3619877d717169b520d664
pdf-font-stream PDF embedded font (sfnt) at offset 0x31CB 22928 bytes
font_01_sfnt_off0000650e.bin
9af8346d408167b6ede5d5a7dd4d3a46039c2b6869b079d0b4f0261630164dcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x650E 19900 bytes