Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f5611308da7b1e…

MALICIOUS

PDF

34.2 KB Created: 2021-06-27 21:41:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 5102e5d6daf7523ec4ef2bee30b49469 SHA-1: bafb44238651f733fa44865fbb4002240a323d3c SHA-256: 55f5611308da7b1ec0d9c549737eea0eae57f91e3af007a41a5b270208a32fe7
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which are presented as download opportunities for game-related hacks and currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and the ML classifier flagged the PDF as malicious with high confidence. The primary goal appears to be directing users to external sites that likely host malware or facilitate scams.

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/how-to-play-roblox-for-free-on-xbox-one-game-hack
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-app-free-download_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-get-free-skins-in-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-hack-awsomeeaglefox25-on-roblox_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/coin-master-hack-2021-app_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-to-hack-free-robux-2021_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/tiktok-free-fans_GM835599320.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-robux-generator-no-verification-2021_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/download-hack-coin-master-apk_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-coins-coin-master_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/cache-http-robuxiancom-howtogetfreerobuxv8_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-roblox-svg_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/como-hackear-a-gente-en-roblox-jailbreak_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/can-you-get-robux-for-free_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-coin-master-links_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/how-can-i-get-free-robux_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/roblox-script-hacks_GM431946152.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/master-coin-master-free-spin_GM406889139.pdf
    • http://www.pustakaekspresi.com/new/public/ckfinder/userfiles/files/free-minecraft-capes-no-mods_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ee6.bin
efd8cd7d49f3eb7babfe0b99a1a02697d2b7356e62916a34c366f2c395cf9efa
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EE6 22360 bytes
font_01_sfnt_off00006063.bin
b9b13e47426f606710d0caf9402aca3a4471f19947b22df6a7e281ce844e1a34
pdf-font-stream PDF embedded font (sfnt) at offset 0x6063 19148 bytes