Malicious PDF — malware analysis report

Static analysis result for SHA-256 def828e6d04ec01a…

MALICIOUS

PDF

43.8 KB Created: 2021-05-15 16:42:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: aafb8d0dbeb94f1d86e3fc7f484299a0 SHA-1: 75f52e318333fd46bf8519765b85594b0ceb9cca SHA-256: def828e6d04ec01aaf640c7cab4ceedf0d9d8284b6d7771f5a8de03abc86e875
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or SEO spam operation. The presence of an MFA lure indicates a potential credential harvesting attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious intent, likely to redirect users to malicious sites or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/how-to-get-free-pets-in-adopt-me-roblox-game-hack
    • http://www.ma-plast.hr/files/coin-master-free-spins-link-2021-april_GM406889139.pdf
    • https://www.ma-plast.hr/files/coin-master-hack-apk-online_GM406889139.pdf
    • http://www.ma-plast.hr/files/coin-master-tiradas-gratis-2021_GM406889139.pdf
    • https://www.ma-plast.hr/files/roblox-fun-com-free-robux_GM431946152.pdf
    • https://www.ma-plast.hr/files/how-to-get-free-robux-on-roblox_GM431946152.pdf
    • http://www.ma-plast.hr/files/how-to-actually-get-free-robux_GM431946152.pdf
    • https://www.ma-plast.hr/files/regal-world-coin-master_GM406889139.pdf
    • http://www.ma-plast.hr/files/coin-master-unlimited-free-spins-link-2021_GM406889139.pdf
    • https://www.ma-plast.hr/files/minecraft-free-minecoins_GM479516143.pdf
    • https://www.ma-plast.hr/files/coin-master-gold-cards-free_GM406889139.pdf
    • https://www.ma-plast.hr/files/coin-master-hack-tool-pc_GM406889139.pdf
    • https://www.ma-plast.hr/files/minecraft-hacked-client-download_GM479516143.pdf
    • http://www.ma-plast.hr/files/free-800-robux_GM431946152.pdf
    • http://www.ma-plast.hr/files/coin-master-links-2021_GM406889139.pdf
    • https://www.ma-plast.hr/files/how-to-get-free-robux-youtube_GM431946152.pdf
    • https://www.ma-plast.hr/files/free-robux-app-real_GM431946152.pdf
    • http://www.ma-plast.hr/files/coin-master-spin-link-hack_GM406889139.pdf
    • https://www.ma-plast.hr/files/minecraft-marketplace-free_GM479516143.pdf
    • https://www.ma-plast.hr/files/coin-master-free-spins-and-coins-2021_GM406889139.pdf
    • http://www.ma-plast.hr/files/coin-master-hack-unlimited-spins_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000480b.bin
e828dabee73e7f5e9c95b938460185494ef1fa77ffe5cced3696bb3e57d39c52
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x480B 26964 bytes
font_01_sfnt_off00008707.bin
ddf32d21812ca42913bb48f22a0284a59638f2c0abe9b9b8a3ace66687a9859d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8707 18916 bytes