Malicious PDF — malware analysis report

Static analysis result for SHA-256 09be8e30db78b258…

MALICIOUS

PDF

43.7 KB Created: 2021-05-11 08:30:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 78a05f2a34759a2b3f10c870fde1875f SHA-1: aa2d37d5d24c0b06e5d766a6da7c629ca5584be7 SHA-256: 09be8e30db78b258a2bdc03e3f7afa9824a937deb6639cd47424ec3cee7cbea8
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF gateways, suggesting a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains references to 'free robux' and 'game hack', aligning with the heuristic findings of a PDF link farm and a potential download lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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.xyz/app/431946152/free-roblox-accounts-with-robux-that-work-not-banned-game-hack
    • https://globair.com.tw/image/data/files/minecraft-wurst-client_GM479516143.pdf
    • https://globair.com.tw/image/data/files/coin-master-hack-apk-facebook-login_GM406889139.pdf
    • https://globair.com.tw/image/data/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • https://globair.com.tw/image/data/files/how-to-get-100-free-spins-on-coin-master_GM406889139.pdf
    • https://globair.com.tw/image/data/files/minecraft-esp_GM479516143.pdf
    • https://globair.com.tw/image/data/files/free-robux-2021_GM431946152.pdf
    • https://globair.com.tw/image/data/files/coin-master-in-app-purchase-hack_GM406889139.pdf
    • https://globair.com.tw/image/data/files/coin-master-hack-spin-generator_GM406889139.pdf
    • https://globair.com.tw/image/data/files/free-robux-images_GM431946152.pdf
    • https://globair.com.tw/image/data/files/free-rare-cards-for-coin-master_GM406889139.pdf
    • https://globair.com.tw/image/data/files/android-coin-master-3433-apk-hack_GM406889139.pdf
    • https://globair.com.tw/image/data/files/free-roblox-promo-codes-for-robux_GM431946152.pdf
    • https://globair.com.tw/image/data/files/abd-roblox_GM431946152.pdf
    • https://globair.com.tw/image/data/files/daily-free-spins-on-coin-master_GM406889139.pdf
    • https://globair.com.tw/image/data/files/roblox-download_GM431946152.pdf
    • https://globair.com.tw/image/data/files/minecraft-bedrock-free-server-hosting_GM479516143.pdf
    • https://globair.com.tw/image/data/files/roblox-login-hack_GM431946152.pdf
    • https://globair.com.tw/image/data/files/how-to-get-free-robux-hack-2021_GM431946152.pdf
    • https://globair.com.tw/image/data/files/mosttechs-coin-master-free-spins_GM406889139.pdf
    • https://globair.com.tw/image/data/files/minecraft-free-download-apk-softonic_GM479516143.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ba6.bin
d566f66977b4a48ee4138d07dfe9f228de160a577cf799cc93ad85d3b9f9100b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BA6 25060 bytes
font_01_sfnt_off000085a6.bin
efa3c9b2c8f55d2ce8a78f8ae751aa117ac14b1934403b15023fd1527a527783
pdf-font-stream PDF embedded font (sfnt) at offset 0x85A6 19248 bytes