Malicious PDF — malware analysis report

Static analysis result for SHA-256 638e835643b3d85e…

MALICIOUS

PDF

44.4 KB Created: 2021-05-18 05:01:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: fdb071eeaa853732a4a88f0a082eb124 SHA-1: 5261ba989d3dc96e1d97c7019f2433a05e72a4b8 SHA-256: 638e835643b3d85e0176f7db4a07f1b3554340af96643bad6cdaf0a41f46dfbb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are structured as SEO-optimized PDF links, suggesting a link farm. The document body and extracted URLs promote 'Free Robux Glitch 2021' and game-related hacks, indicating a lure for users to download potentially malicious content. The ML classifier also flagged this PDF as malicious.

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 https://netcdn.xyz/app/431946152/free-robux-glitch-2021-game-hack
    • http://iprep-u.com/images/coin-master-daily-spins-and-coins_GM406889139.pdf
    • http://iprep-u.com/images/free-robux-pin-codes_GM431946152.pdf
    • http://iprep-u.com/images/how-do-i-get-robux_GM431946152.pdf
    • http://iprep-u.com/images/coin-master-hack-version-2021-free-download_GM406889139.pdf
    • http://iprep-u.com/images/coin-master-spin-hack-2021_GM406889139.pdf
    • http://iprep-u.com/images/haktuts-coin-master-free-spin-link-today_GM406889139.pdf
    • http://iprep-u.com/images/coin-master-free-daily-spins-link_GM406889139.pdf
    • http://iprep-u.com/images/coin-master-hack-apk-2021_GM406889139.pdf
    • http://iprep-u.com/images/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • http://iprep-u.com/images/websites-that-give-free-robux_GM431946152.pdf
    • http://iprep-u.com/images/free-links-to-coin-master_GM406889139.pdf
    • http://iprep-u.com/images/wurst-112-2_GM479516143.pdf
    • http://iprep-u.com/images/how-to-hack-to-get-robux_GM431946152.pdf
    • http://iprep-u.com/images/free-coins-on-coin-master_GM406889139.pdf
    • http://iprep-u.com/images/hack-xp-net-coin-master_GM406889139.pdf
    • http://iprep-u.com/images/roblox-free-robux-generator_GM431946152.pdf
    • http://iprep-u.com/images/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://iprep-u.com/images/coin-master-free-spins-link-today-haktuts_GM406889139.pdf
    • http://iprep-u.com/images/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://iprep-u.com/images/free-coins-coin-master-2021_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b85.bin
c7bafea62c5d31c53ae4577f4a4e0cbcde26a144f5deff13a6acf79f73a18389		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B85 26564 bytes
font_01_sfnt_off00008990.bin
e0b2f5218feb7ccbc61643c87456d5d0b0f9dddc4acedfb65bbbea4baf30e52d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8990 18880 bytes

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