Malicious PDF — malware analysis report

Static analysis result for SHA-256 e581a9804cd4cd1f…

MALICIOUS

PDF

42.3 KB Created: 2021-05-14 12:00:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1cf1799cbc9fa86c0819d8f2a79d025f SHA-1: 15dda83ae926ce66683a59df6da54824166ded07 SHA-256: e581a9804cd4cd1f2c0434fac6748fc4034a12f6ccb86131acd01a37705cb81a
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links to external PDF files, a technique often used for SEO spam or to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of a "download button" lure further supports a malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs suggest a workflow designed to redirect users to potentially harmful content.

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/coin-master-heaven-free-spins-link-game-hack
    • http://leagueforwomenrights.gr/images/free-robux-hack-no-verification_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/coin-master-generator-free_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/free-robux-codes-no-human-verification_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/coin-master-game-download-free_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/free-spins-on-coin-master-link_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/coin-master-free-spins-link-today_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/coin-master-hack-unlimited-spins_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/download-coin-master-hack-apk_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/daily-coin-master-free-spins_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/how-to-hack-roblox-accounts-passwords_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/coin-master-hack-game-download_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/codes-to-get-free-robux_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/free-spin-coin-master-2021-link_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/coin-master-daily-free-spins-link-today_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/rbl-gg-free-robux_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • http://leagueforwomenrights.gr/images/easy-robux-generator_GM431946152.pdf
    • http://leagueforwomenrights.gr/images/coin-master-gameplay_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004948.bin
3be3413fcc9cd0fab81e9d056fc344183709236608e4f4f7be8463794edbc29f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4948 25448 bytes
font_01_sfnt_off00008327.bin
61c553a771cad2049f64e942d03728efad013d4bfea0708bec7d3446f8b125ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8327 18168 bytes

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