Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff97d5e01fc8f774…

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 12:30:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: af31c8413d6032732d000927a3d829c8 SHA-1: 9e5c5200cefb56ff319c12a31b7fbfbd8b08970d SHA-256: ff97d5e01fc8f7743c6c6a34af71f2453e6977568015309f8782ad400c17a839
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external PDF files, many of which are SEO-optimized with game-related keywords, suggesting a link farm designed to attract users interested in free game items or cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs and a 'download button' heuristic further supports a malicious intent to redirect users to potentially harmful content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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/479516143/minecraft-clipart-free-game-hack
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-cheap-pubg-uc_GM1330123889.pdf
    • https://ifef.es/ckfinder/userfiles/files/robux-generator-no-verification-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-bedrock-free-with-java_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/rbl-gg-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-do-you-get-free-food-in-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/cool-free-minecraft-skins_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-hair-on-roblox-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/coin-master-hack-link_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-tiktok-followers-instantly_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/can-u-get-free-robux_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-robux-no-verification-at-all_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/pubg-uc-buy-online-pakistan_GM1330123889.pdf
    • https://ifef.es/ckfinder/userfiles/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-fans-on-tiktok_GM835599320.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/free-minecraft-hacks_GM479516143.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • https://ifef.es/ckfinder/userfiles/files/how-to-get-free-mods-in-minecraft_GM479516143.pdf
    • https://sigmaclient.info#2
    • https://flux.today#3
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005484.bin
7bfd84b85c47884c469b3d47ba62d936871d967133b28e78ec75db70f1547d39
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5484 26612 bytes
font_01_sfnt_off00009119.bin
91cd75b72efc4400f550dd169e429811ff3a09c689ab9966efef0c18f18efa2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9119 17816 bytes