Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d0b54076192294…

MALICIOUS

PDF

42.0 KB Created: 2021-05-12 02:12:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 8b7da3da0c569e98f7daa8f697bba0e0 SHA-1: bd437c09a1a6819cc5e6f5ef88bb3d7156c6bd2c SHA-256: 71d0b54076192294aa87afc769b7577de877d6a27471d693e129440466f46192
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are presented as 'SEO links' pointing to pages offering game hacks and cheats. The document body and extracted URLs suggest a lure for users seeking to cheat in games like Coin Master and Roblox, likely leading to malware downloads or phishing. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a link farm or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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/406889139/coin-master-shield-hack-game-hack
    • http://www.eucorro.com/arquivos/files/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://www.eucorro.com/arquivos/files/minecraft-pe-hacks_GM479516143.pdf
    • http://www.eucorro.com/arquivos/files/free-robux-for-kids-no-verification_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/how-to-get-more-spins-on-coin-master-for-free_GM406889139.pdf
    • http://www.eucorro.com/arquivos/files/apps-that-give-you-free-robux_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/coin-master-hack-tool-v1-9-apk_GM406889139.pdf
    • http://www.eucorro.com/arquivos/files/how-to-buy-robux-for-free_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/tryrbx-site-free-robux_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/where-can-i-get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.eucorro.com/arquivos/files/how-to-get-daily-free-spins-on-coin-master_GM406889139.pdf
    • http://www.eucorro.com/arquivos/files/get-free-robux-com_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdf
    • http://www.eucorro.com/arquivos/files/all-free-items-in-roblox_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/free-roblox-templates_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/robux-2021_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/download-coin-master-hack-tool-v1-9_GM406889139.pdf
    • http://www.eucorro.com/arquivos/files/roblox-free-robux-website_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/free-minecraft-skins-pc_GM479516143.pdf
    • http://www.eucorro.com/arquivos/files/can-you-actually-get-free-robux_GM431946152.pdf
    • http://www.eucorro.com/arquivos/files/free-roblox-avatar_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000499f.bin
e68286baf185aeda792f0f6590fdac700fed4a837f203b18bc8fd24a11fb3207
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x499F 25144 bytes
font_01_sfnt_off0000825a.bin
2773020a9ca51f28bcb030d2519f478b200dd757f17da2a4e62f9d950a58fe27
pdf-font-stream PDF embedded font (sfnt) at offset 0x825A 18128 bytes