Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4fdd3946afb2cf…

MALICIOUS

PDF

43.6 KB Created: 2021-05-16 05:34:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 4cc53086ee59d43da5f2d5c4364cc4b3 SHA-1: b2e5e1e71617f2391c86752a8bb4055a1272a65f SHA-256: ce4fdd3946afb2cf700c657a7d49b7580dd8cb7b5e15a88df9a83003ba27269d
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering game hacks and free currency. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests a link farm or redirection to malicious content. The document body itself contains a URL that appears to be a direct link to a game hack, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/roblox-hack-ios-game-hack
    • https://humansci.kyst.com.tw/image/data/files/coin-master-links-free-spins_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/free-spins-and-coins-for-coin-master_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/minecraft-linux-free_GM479516143.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-2021-no-human-verification_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-daily-spins-today_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/http-bitly-coin-master-free-2021-spins_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-cheat_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/rbxfree-com-free-robux_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/free-roblox-card_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-hack-programmers_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/mobihack-net-roblox-hack_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-spins-hack-2021_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/roblox-inappropriate_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-to-get-free-robux-without-email_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-gift-link-2021_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-cheats_GM406889139.pdf
    • https://humansci.kyst.com.tw/image/data/files/coin-master-free-pet-food_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049fb.bin
a72adfc9427b96ea52b8c2004ded2057a94e2c902df5a6a5c51b22550027e0bf		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FB 26780 bytes
font_01_sfnt_off0000887b.bin
f12c7157a0abee9a7103123c9d307fa47fe2494659220a603733cc764a4b7828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887B 18184 bytes

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