Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd158420a34e51c…

MALICIOUS

PDF

35.2 KB Created: 2021-07-03 23:16:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d7ff84bd64aef3d2ba20438d8e7e71de SHA-1: c84972cd2f7a9eea6b7877e561fa38c5d18423b5 SHA-256: 8cd158420a34e51c5416b9575a4fc061dbefff7c42c53c0bafcead146a4e9ebb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites and PDF files, many of which are related to hacking games like Roblox and obtaining in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of these external links, suggesting a link farm designed to attract users with deceptive content. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains keywords related to game hacking and URLs that reinforce this malicious intent.

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/431946152/how-to-hack-roblox-accounts-for-robux-game-hack
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-works-no-survey_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/free-coins_GM406889139.pdf
    • https://adoz.cz/ckfinder/userfiles/files/ccv3-roblox-jailbreak-speed-hack_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/hack-to-get-into-vip-room-in-forgotten-world-roblox_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-no-survey-or-human-verification_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/how-to-hack-roblox-with-crosh_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/free-minecraft-skins-pe_GM479516143.pdf
    • https://adoz.cz/ckfinder/userfiles/files/roblox-assassin-how-to-get-free-knives_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/app-master_GM406889139.pdf
    • https://adoz.cz/ckfinder/userfiles/files/bux-free-robux_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-free_GM406889139.pdf
    • https://adoz.cz/ckfinder/userfiles/files/how-to-get-minecraft-realms-for-free_GM479516143.pdf
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-hack-website_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/hack-murder-mystery-roblox-a-telecharger-gratuitement_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • https://adoz.cz/ckfinder/userfiles/files/moana-roblox-cheats_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/can-i-hacked-my-own-roblox-account-got_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/free-robux-hack-no-human-verification-or-survey_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/free-roblox-gift-codes-2021_GM431946152.pdf
    • https://adoz.cz/ckfinder/userfiles/files/how-to-get-free-clothes-on-roblox-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003060.bin
8aa70fee34a139bfd792cddd1775d8b135350f01950d2c47384765858b00bf47
pdf-font-stream PDF embedded font (sfnt) at offset 0x3060 23056 bytes
font_01_sfnt_off00006427.bin
c30d944de0a6baf9276c4865844fcb990da37fa04730b451441052e57c665125
pdf-font-stream PDF embedded font (sfnt) at offset 0x6427 19228 bytes