Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b43b6d7047d48a4…

MALICIOUS

PDF

45.1 KB Created: 2021-06-10 22:30:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c8e4a63102a48b9631f5dc1a1a212c68 SHA-1: 58ff3ca4af01362a028b0af7e8919190ae531b6a SHA-256: 0b43b6d7047d48a469dfe6433145d95cb7c5eef67e7334f56d84a9c4302d98c7
142 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on studioarad.ro and relate to game hacking and exploits. The presence of a fake CAPTCHA heuristic indicates a social engineering attempt to trick the user into interacting with these links. The ML classifier also flagged this PDF as malicious, supporting the overall assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/roblox-asset-download-for-shirt-template-free-game-hack
    • http://studioarad.ro/images/how-to-hack-coin-master-with-game-guardian_GM406889139.pdf
    • http://studioarad.ro/images/earn-free-robux_GM431946152.pdf
    • http://studioarad.ro/images/free-spins-coin-master-app_GM406889139.pdf
    • http://studioarad.ro/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdf
    • http://studioarad.ro/images/coin-master-daily-free-spins-link-facebook_GM406889139.pdf
    • http://studioarad.ro/images/downlaod-roblox-free_GM431946152.pdf
    • http://studioarad.ro/images/coin-master-free-spins-link-2021-today_GM406889139.pdf
    • http://studioarad.ro/images/free-coin-master-spins-blog_GM406889139.pdf
    • http://studioarad.ro/images/fbchampion-com_GM406889139.pdf
    • http://studioarad.ro/images/free-roblox-accounts-2021_GM431946152.pdf
    • http://studioarad.ro/images/minecraft-free-app_GM479516143.pdf
    • http://studioarad.ro/images/how-to-get-free-tiktok-followers_GM835599320.pdf
    • http://studioarad.ro/images/how-to-give-robux-on-mobile_GM431946152.pdf
    • http://studioarad.ro/images/minecraft-windows-10-edition-unlock-full-game-free_GM479516143.pdf
    • http://studioarad.ro/images/coin-master-free-coins-and-spins_GM406889139.pdf
    • http://studioarad.ro/images/minecraft-marketplace-free_GM479516143.pdf
    • http://studioarad.ro/images/free-robux-generator_GM431946152.pdf
    • http://studioarad.ro/images/free-24-7-minecraft-server_GM479516143.pdf
    • http://studioarad.ro/images/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://studioarad.ro/images/free-spin-coin-master-link-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005047.bin
e3a47d9871f3d5496488fea38da2841ee4639ae6638f30f0115571ac3712a974
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5047 25052 bytes
font_01_sfnt_off00008a22.bin
5d768299ebb77ad68c72aedeca3636c128e6b66995023c1102b77f44b38ac8ce
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A22 19508 bytes