Malicious PDF — malware analysis report

Static analysis result for SHA-256 864940676f272a1b…

MALICIOUS

PDF

34.8 KB Created: 2021-06-26 14:40:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: d88834c90ed6e1cb10e4a8f2d9f444b9 SHA-1: 20401bccbe59c48c22d346181aac1961ebf91744 SHA-256: 864940676f272a1b64bdd00a4ec830668d84820386fdcdd9d186586367ef8f4c
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are SEO-optimized and point to resources related to game hacks and free in-game currency. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content or downloads.

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.co/app/431946152/one-by-one-by-one-in-april-fools-roblox-hacking-game-hack
    • https://yeushuen.com.tw/image/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/how-to-get-20210-robux-for-free_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/can-you-give-me-free-robux_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/minecraft-for-free-on-phone_GM479516143.pdf
    • https://yeushuen.com.tw/image/data/files/mcpe-master-coins-hack-download_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/free-robux-without-downloading-apps_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/wurst-hacked-client_GM479516143.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-free-spins-links-app_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/vip-roblox-free_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/youtube-cheat-roblox_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-free-stuff_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/play-minecraft-for-free_GM479516143.pdf
    • https://yeushuen.com.tw/image/data/files/free-robux-no-apps_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/robux-offers_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/how-to-play-minecraft-for-free_GM479516143.pdf
    • https://yeushuen.com.tw/image/data/files/coin-master-hack-without-verification_GM406889139.pdf
    • https://yeushuen.com.tw/image/data/files/fre-click-tp-roblox-script_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/roblox-hack-unlimited-robux_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/free-robux-that-actually-works-2021_GM431946152.pdf
    • https://yeushuen.com.tw/image/data/files/free-spins-coin-master-links-twitter_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002ef2.bin
21f0622b7cdadade42027cbee1994a4569c75dd345a8ee47fbf3a5fd7ffd9e9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x2EF2 22880 bytes
font_01_sfnt_off00006235.bin
2ccdd2d41333f68de78242226f4af4aeac63a5725f1fc97816b27f7eebe85692
pdf-font-stream PDF embedded font (sfnt) at offset 0x6235 19296 bytes