Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cfc1c0da98126db…

MALICIOUS

PDF

49.0 KB Created: 2021-06-03 12:42:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 28963a73fe834f95b7f0123bd60aa65f SHA-1: 3e407a3c9650ff55178e25101761e59c3f848131 SHA-256: 8cfc1c0da98126db3acbba6d85a47d104afed4f780fbb12f5353ccc2e47e26e4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, all related to obtaining free in-game currency or items. The ML classifier and PDF link farm heuristics strongly indicate malicious intent. The presence of a "download button" lure further supports a deceptive workflow designed to trick users into visiting these external sites, which likely host phishing pages or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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 https://netcdn.online/app/431946152/how-to-get-free-robux-on-android-game-hack
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-verified-on-tiktok-for-free-2021_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-ios-app_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/is-minecraft-free-on-nintendo-switch_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-generator-no-verification-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-games-like-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-websites-that-actually-work-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/www-roblox-com-robux-free_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hacks-no-verification_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/roblox-help-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/complete-offers-for-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/hack-para-coin-master-singapore_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/hack-coin-master-free-spins_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-pet-snacks-in-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-robux-gift-cards_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-mods-for-xbox-one_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spin-coin-master-twitter_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-accounts-2021_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005142.bin
37280b620b76d76a492d541bfa2e372cd95f148ab0e7191c089321e754da0958
pdf-font-stream PDF embedded font (sfnt) at offset 0x5142 32076 bytes
font_01_sfnt_off00009c79.bin
be12fe34256d848f1a7db569f7882c3333b0548de7731ecd127307da0fa566a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C79 18576 bytes