Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5933814b0f37563…

MALICIOUS

PDF

35.5 KB Created: 2021-07-04 02:19:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 527cedd90977bf8a53c602e962d8c0bf SHA-1: 7fb26e37c6c79a1198bca31bf89c9b9ef542b189 SHA-256: e5933814b0f3756360b5eb1088331b3c4395e7230eada9ad5f0bc23eb279969f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a link farm, strongly suggesting it is designed to redirect users to malicious websites. The ML classifier and PDF SEO link farm heuristic indicate a high likelihood of malicious intent, likely to distribute malware or facilitate phishing. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure, possibly leveraging JavaScript for exploitation.

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/games-to-get-free-robux-game-hack
    • https://www.ruchya.com.tw/upload/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/free-robux-generator-no-human-verification-2021_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-spins-on-coin-master-hack_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/hey-google-how-do-you-get-free-robux_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/minecraft-ore-finder-mod_GM479516143.pdf
    • https://www.ruchya.com.tw/upload/files/free-robux-2021-no-hacks_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/coin-master-free-coins_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-games_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-roblox-accounts-pastebin_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/can-you-get-in-trouble-hacking-on-roblox_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/como-atravesar-paredes-en-roblox-hack_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-unlimited-robux_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-robux-games-that-actually-work_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/roblox-font-generator-free_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/tiradas-coin-master_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/free-coin-master-spin-app_GM406889139.pdf
    • https://www.ruchya.com.tw/upload/files/tiktok-like-bot-free_GM835599320.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-get-free-robux-hack_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/how-to-hack-a-roblox-game-2021_GM431946152.pdf
    • https://www.ruchya.com.tw/upload/files/free-robux-without-human-verification-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_off0000323b.bin
2d5732434b0733dcd5e0857b5a70871fde2ccc9eca9ad6945f6506fc081199ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x323B 23072 bytes
font_01_sfnt_off000065d3.bin
03ba3cd79afa517eed98ce6a768f8c6318a94a6bbf9eb4faa980b5a438220dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x65D3 19080 bytes