Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc57af22bfe3554c…

MALICIOUS

PDF

42.1 KB Created: 2021-05-19 23:45:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 281c74729d94a38e7ea4ac6f76788562 SHA-1: 8b6cac5ce7f58f3a2df11b638b4c3783fc9fd629 SHA-256: fc57af22bfe3554cf47979b139459cf07f313f31d6aa893aef1b20874de2c389
102 Risk Score

Malware Insights

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

The PDF contains an embedded URL pointing to a suspicious application download and a large number of external links to SEO-optimized PDF files, suggesting a link farm or distribution mechanism. The presence of a 'download' button lure further supports the malicious intent of directing users to external content. No scripts were extracted from this sample.

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/431946152/freerubux-game-hack
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-hack-pro-gamers-com_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/get-free-spins-for-coin-master_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-do-you-get-free-coins-in-coin-master_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-fan-page-facebook_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-coins-and-spins-coin-master_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/2021-free-spins-coin-master_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-spins-in-coin-master-without-human-verification_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-fly-hack_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/play-minecraft-for-free_GM479516143.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-get-free-coins-on-flip-master_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-coin-master-cards_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/can-i-get-robux-for-free_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/coin-master-card-hack_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/how-to-download-minecraft-for-free-on-mac_GM479516143.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/roblox-free-robux-no-human-verification_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-robux-without-human-verification_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-spin-coin-master-link-today_GM406889139.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/free-robux-quiz_GM431946152.pdf
    • http://www.biotrade.com.au/uploaded_files/userfiles/files/100-free-spins-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_off00004a6a.bin
540aaaa4812653785095ecf91c97fa55902a8558a575c8f3c5f671f287a902c3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6A 25176 bytes
font_01_sfnt_off0000838e.bin
f4416bbc5f287efcbe31c7b4c704cc92a0ced0ddcdd2f5cfb5fb7d41fdf7fc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x838E 17872 bytes

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