Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d43a13d2a458ec2…

MALICIOUS

PDF

35.0 KB Created: 2021-07-04 11:46:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: eb044bdea4123c24d1039dfb8409ac4e SHA-1: b3ed6413bd52939d9bc9c1f14c9d83d6c7ff29d0 SHA-256: 4d43a13d2a458ec27d0c6a7bc2452944e9e2c0247d3a76b69cfdf5aa3313e063
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are SEO-optimized PDFs related to game hacks and cheats. The primary URL http://netcdn.tw/app/479516143/free-minecraft-bedrock-game-hack suggests a lure for downloading malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of 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/479516143/free-minecraft-bedrock-game-hack
    • https://dentmate.com.tw/image/data/files/is-it-possible-to-get-robux-for-free_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-hack-epic-minigames-wins-roblox_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/vortexx-roblox-free-robux-pastebin_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/roblox-free-clothes-website_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/why-are-free-robux-games-on-front-page_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/free-spins-on-coin-master_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/free-crush-famliy-roblox-id_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/free-roblox-skin-codes_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/rbxoffers-earn-free-robux_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/logo-roblox-cafe-gfx-free_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/free-robux-on-phone_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/how-to-hack-roblox-admin-with-cheat-engine-63_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-get-free-spins-in-coin-master_GM406889139.pdf
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-without-verifying_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-get-free-robux-fast-and-easy_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/roblox-counter-blox-hacks-2021-download_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/roblox-free-no-login-or-password_GM431946152.pdf
    • https://dentmate.com.tw/image/data/files/how-to-cheat-on-ramboredkill-in-roblox_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000328b.bin
e4e57f693d38f16180d0b00d105f6b4d31afc6a398eab90d30055490aa630476
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x328B 22748 bytes
font_01_sfnt_off0000658c.bin
8a1cf310a32837577002de6ae703504663fc8f6c74f3557264522e251e416ebe
pdf-font-stream PDF embedded font (sfnt) at offset 0x658C 18560 bytes