Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a9fbee22d5a212…

MALICIOUS

PDF

44.2 KB Created: 2021-06-07 03:42:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 825d3f15b225fce4d5ad764e60e929a8 SHA-1: 73ce85b4ed8fa5d7a5463e3cc9727e5f1091c7dc SHA-256: 71a9fbee22d5a2120173e5f85b5e4367ddcae84b7e25094757eae72fa5ff45df
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, identified as a link farm, pointing to various game-related hacks and free items. The ML classifier strongly flagged this PDF as malicious. The presence of a 'Download Now' heuristic suggests a lure to click these links, which likely lead to scam or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/free-stuff-in-the-roblox-catalog-game-hack
    • http://zarinnameh.ir/images/mcpe-master-hack-unlimited-coins-download_GM406889139.pdf
    • http://zarinnameh.ir/images/coin-master-free-spins-link-october-2021_GM406889139.pdf
    • http://zarinnameh.ir/images/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://zarinnameh.ir/images/is-minecraft-education-edition-free_GM479516143.pdf
    • http://zarinnameh.ir/images/how-to-get-free-robux-easy-2021_GM431946152.pdf
    • http://zarinnameh.ir/images/coin-master-free-spins-and-coins-generator_GM406889139.pdf
    • http://zarinnameh.ir/images/coin-master-spin-free_GM406889139.pdf
    • http://zarinnameh.ir/images/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://zarinnameh.ir/images/how-to-get-free-robux-generator_GM431946152.pdf
    • http://zarinnameh.ir/images/how-to-get-minecraft-for-free-on-mac_GM479516143.pdf
    • http://zarinnameh.ir/images/114-4-hacks_GM479516143.pdf
    • http://zarinnameh.ir/images/download-minecraft-bedrock_GM479516143.pdf
    • http://zarinnameh.ir/images/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdf
    • http://zarinnameh.ir/images/how-to-hack-someone-on-roblox_GM431946152.pdf
    • http://zarinnameh.ir/images/free-minecraft-svg-cutting-files_GM479516143.pdf
    • http://zarinnameh.ir/images/how-do-i-get-free-coins-on-coin-master_GM406889139.pdf
    • http://zarinnameh.ir/images/roblox-games-with-free-vip-servers_GM431946152.pdf
    • http://zarinnameh.ir/images/minecraft-login-free_GM479516143.pdf
    • http://zarinnameh.ir/images/titan-simulator-roblox-hack_GM431946152.pdf
    • http://zarinnameh.ir/images/free-robux-hack-no-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004f11.bin
8b2425888683504a13bb03c577135d2be277e7ebeab68006389f69ebcb3c99c0		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F11 24768 bytes
font_01_sfnt_off00008825.bin
307987b9147626df10361976716565c88793664412070d7e27e98841a27cdf04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8825 18876 bytes

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