Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa723c85e21e7f7…

MALICIOUS

PDF

46.6 KB Created: 2021-06-07 20:51:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 71aa77064a080cfc5611a479e9fac66f SHA-1: 8eb77b58a743ce7ae8132b6e4a90ee82c2b76371 SHA-256: 8fa723c85e21e7f720377a429b55b4d773689ad5ac685be7af94e14a5b04ad2c
102 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external links to various websites, many of which are related to gaming cheats and hacks. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic suggests a deceptive user interface. The document likely serves as a lure to drive traffic to these external sites, which could host further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/is-roblox-free-on-the-nintendo-switch-game-hack
    • http://inextpresident.com/images/how-do-you-get-robux-on-roblox_GM431946152.pdf
    • http://inextpresident.com/images/minecraft-font-free_GM479516143.pdf
    • http://inextpresident.com/images/how-to-hack-roblox-to-get-free-robux_GM431946152.pdf
    • http://inextpresident.com/images/how-do-i-get-free-robux_GM431946152.pdf
    • http://inextpresident.com/images/coin-master-hack-with-lucky-patcher_GM406889139.pdf
    • http://inextpresident.com/images/how-to-get-free-hair-on-roblox-2021_GM431946152.pdf
    • http://inextpresident.com/images/roblox-jailbreak-hack_GM431946152.pdf
    • http://inextpresident.com/images/how-to-play-minecraft-for-free-on-computer_GM479516143.pdf
    • http://inextpresident.com/images/coin-master-spin-and-coins-free_GM406889139.pdf
    • http://inextpresident.com/images/get-free-tiktok-fans_GM835599320.pdf
    • http://inextpresident.com/images/free-coins_GM406889139.pdf
    • http://inextpresident.com/images/coin-master-fan-page-free-spins_GM406889139.pdf
    • http://inextpresident.com/images/coin-master-hack-android-root_GM406889139.pdf
    • http://inextpresident.com/images/free-spin-link-for-coin-master_GM406889139.pdf
    • http://inextpresident.com/images/free-robux-games-that-actually-work-2021_GM431946152.pdf
    • http://inextpresident.com/images/free-roblox-followers-generator_GM431946152.pdf
    • http://inextpresident.com/images/coin-master-hack-apk_GM406889139.pdf
    • http://inextpresident.com/images/apps-that-give-you-free-robux_GM431946152.pdf
    • http://inextpresident.com/images/roblox-robux-hack-generator_GM431946152.pdf
    • http://inextpresident.com/images/coin-master-hack-tool_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a5.bin
d76d2c67492ab0a990d4c730cff5395685e8cb901e8ae7faf87f377f5e878fa7
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A5 29036 bytes
font_01_sfnt_off00009270.bin
4acf9912c248bb530569a6ed56c0a82470049266e8699bb52cdd7f40c82b6e7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x9270 18676 bytes