Malicious PDF — malware analysis report

Static analysis result for SHA-256 574b296efc50ffee…

MALICIOUS

PDF

33.3 KB Created: 2021-07-03 15:08:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: cc28d049638d2f28d2b04497184419a4 SHA-1: dc256481a799d0fc2564706b40c20e464ef226ab SHA-256: 574b296efc50ffee65c61e0f8408f3a3b6b4cf9207abf324926ba1c46e3d425e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO spam. The document body and extracted URLs suggest a lure for free Robux and game cheats, indicating a phishing or scam attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of external URI links supports this assessment.

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/lazyblox-com-free-robux-game-hack
    • http://www.3d-gold.com.hk/upload/files/tryrbx-site-free-robux_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/how-do-i-get-free-robux-without-human-verification_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/tiktok-free-view-iphone-apps_GM835599320.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-free-coins-link-2021-deutsch_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/dbor-hack-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-robux-glitch_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-become-a-hacker-in-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-shoulder-pets-in-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/hack-for-robux-script_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-tiktok-likes-no-human-verification-or-download_GM835599320.pdf
    • http://www.3d-gold.com.hk/upload/files/free-online-games-like-minecraft_GM479516143.pdf
    • http://www.3d-gold.com.hk/upload/files/aimbot-hack-for-roblox-cbro-fps-gui-10_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-report-hack-on-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/get-in-youtube-with-writing-roblox-retail-tycoon-shop-hack_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/coin-master-apk-hack-358_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/how-to-hack-to-get-robux-in-roblox_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-roblox-gift-card-codes-december-2021_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/free-robux-dezs-nuts_GM431946152.pdf
    • http://www.3d-gold.com.hk/upload/files/hack-coin-master-nyc_GM406889139.pdf
    • http://www.3d-gold.com.hk/upload/files/free-spins-coin-master-2021-app_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002cc9.bin
781cffd83049f137d74096d1260bac7e391b70ac32a973d6a6012efa6d881900
pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC9 21628 bytes
font_01_sfnt_off00005c46.bin
f9ede7273c4848aab069705d78d47b2d010167552475a4dce029ed291f713c56
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C46 19312 bytes