Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4c17d9e2e831c4…

MALICIOUS

PDF

40.8 KB Created: 2021-05-16 03:35:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e66be933c26cdd06b2f64db07a34348c SHA-1: bf09ae32fb12a6e1f7a73131d5ee2cc45d0e091c SHA-256: 4a4c17d9e2e831c45dc25f025f99be3400921ab5293a20092e4c77e500d5a89e
102 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are SEO-optimized and point to pages offering game cheats and hacks. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and a link farm indicates an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains references to game cheats and a URL that likely serves as a download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-cheats-free-game-hack
    • http://winnerwater.com.tw/image/data/files/coin-master-hacks-for-free-spins_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spin-and-coin-link-2021-today_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/free-roblox-premium_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/free-spin-link-for-coin-master_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/minecraft-skins-free-girl_GM479516143.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-hack-free-spins_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/com-roblox_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/today-coin-master-spin-free_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/free-robux-com-real_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/what-are-points-for-in-roblox_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/hack-coin-master-free_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/hacks-to-get-free-robux_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/roblox-free-clothes-codes_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/hack-free-spin-coin-master_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/best-way-to-get-free-robux_GM431946152.pdf
    • http://winnerwater.com.tw/image/data/files/coin-master-online_GM406889139.pdf
    • http://winnerwater.com.tw/image/data/files/ear-free-spins-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004719.bin
e3e09fe668cb4804e301841b56bd60965793d09cc5f6c7b81c8c599842ef982c
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4719 24444 bytes
font_01_sfnt_off00007e6d.bin
3080be39145a7e19e49f31c27d216b7ef11c5a53cf2903de633486ff32396878
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E6D 17876 bytes