Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf592aafca1c03c2…

MALICIOUS

PDF

42.0 KB Created: 2021-05-11 22:39:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 622a248d1adc9d03a0e94ea2cf182492 SHA-1: 7f9780b4f1a4054da7d9784ff314912ea9639245 SHA-256: cf592aafca1c03c2df1951098e0aa5f74ac51622cde3137a36eb695adeed3dfd
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a large number of external PDF links, indicating a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests a potential for downloading further payloads or redirecting users to malicious sites. The document body itself is heavily obfuscated and contains references to game hacks and free spins, likely a lure.

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/i-can
    • https://bookswithapast.com/ckfinder/userfiles/files/free-minecraft-hosting_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-spin-link-of-coin-master_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-and-coins-today_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hacks-for-spins_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hack-review_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-sites-that-work_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/woman-roblox_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-hack-mobile_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/rbx-sites_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-roblox-hair-to-wear_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-to-get-free-robux-no-verification_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-spins-hack-download_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-free-cards-hack_GM406889139.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-roblox-card-codes_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/how-do-you-get-free-roebucks_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/free-robux-codes-2021_GM431946152.pdf
    • https://bookswithapast.com/ckfinder/userfiles/files/coin-master-fan_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004c23.bin
b5d5faecb42c5f25cc79660919db0cc3d4623801cc2942233a1708053ac8c497
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C23 24076 bytes
font_01_sfnt_off000082c7.bin
ff0c2fd87def8c3d08bc052d35a059552b69b6ff80e738d461809d40e2b5bde5
pdf-font-stream PDF embedded font (sfnt) at offset 0x82C7 17952 bytes