Malicious PDF — malware analysis report

Static analysis result for SHA-256 7484b3e4939eaec8…

MALICIOUS

PDF

32.9 KB Created: 2021-07-05 11:04:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 20eedcfaf7de53c038e5a1f3922da99a SHA-1: b2ce00cc05b75397530429ad9ec1f2fa1405b565 SHA-256: 7484b3e4939eaec8a345e26bf491c312fe44594d500ec30bbb614f71481821cf
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links, many of which are SEO-optimized and point to game-related hacks and free currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly suggests maliciousness. The document likely serves as a lure to download further malicious content or redirect users to phishing sites.

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/406889139/clean-master-coins-hack-game-hack
    • https://esl.hess.com.tw/image/data/files/game-kit-free-800-robux_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/free-coins-and-spins-in-coin-master_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/blogger-free-spins-and-coins_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-robux-on-android_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/hacks-for-roblox-phantom-forces-2021_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/how-to-make-free-shirts-on-roblox-2021_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/roblox-shard-seekers-hack_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/free-robux-picture_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/free-robux-gift-card-codes_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/minecraft-thumbnail-maker-free_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/free-minecraft-skin-creator_GM479516143.pdf
    • https://esl.hess.com.tw/image/data/files/tiktok-free-unlimited-likes_GM835599320.pdf
    • https://esl.hess.com.tw/image/data/files/how-to-hack-murder-mystery-2-on-roblox-with-nopdengine_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/nonsense-diamond-roblox-hack-download_GM431946152.pdf
    • https://esl.hess.com.tw/image/data/files/how-to-get-free-coins-and-spins-on-coin-master_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/free-spin-link-coin-master-today_GM406889139.pdf
    • https://esl.hess.com.tw/image/data/files/free-spins-coin-master-daily_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ce4.bin
f336633a8b664c45247e04d3f57bfae456a84eb64c3fc903c6d5ba7dc9236673
pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE4 22256 bytes
font_01_sfnt_off00005e63.bin
9c2bf1894890945564fd7824672aa39d3658e30de4050c3be4bdf1a4a3dd007e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E63 18080 bytes