Malicious PDF — malware analysis report

Static analysis result for SHA-256 4555d7cb750d0a60…

MALICIOUS

PDF

144.8 KB Created: 2024-10-01 10:32:05 +03:00 Authoring application: Microsoft® Word 2021
MD5: 4a1643f4ac2ff7901fa55d8c347f49c8 SHA-1: b6892fcec850a1dc9d20418c4e2d70f2dac2792f SHA-256: 4555d7cb750d0a60496f06aa8b5e16b333626adfc9e150e033745b3c95d8dc5e
62 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a direct link to an executable archive, indicated by the PDF_DIRECT_PAYLOAD_LINK heuristic. The embedded URL, https://bitbucket.org/invoicepays/file/downloads/doc.7z, is the primary indicator of this malicious intent. The document body is heavily obfuscated, preventing a more detailed analysis of its specific content, but the direct payload link strongly suggests a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier clean score 0.0001

Heuristics 2

  • PDF link points directly to executable/archive payload critical PDF_DIRECT_PAYLOAD_LINK
    PDF contains a clickable HTTP(S) URI whose path ends in an executable, script, shortcut, disk image, or archive extension. Documents can legitimately link to installers, so this is a high-risk delivery indicator rather than a standalone exploit fingerprint.
  • 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://bitbucket.org/invoicepays/file/downloads/doc.7z
    • http://www.microsoft.com0
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://en.wikipedia.org/wiki/MIT_License
    • http://crl.microsoft.com/pki/crl/products/MicCodSigPCA_2010-07-06.crl0Z
    • http://www.microsoft.com/pki/certs/MicCodSigPCA_2010-07-06.crt0
    • http://crl.microsoft.com/pki/crl/products/MicRooCerAut_2010-06-23.crl0Z
    • http://www.microsoft.com/pki/certs/MicRooCerAut_2010-06-23.crt0��
    • http://www.microsoft.com/PKI/docs/CPS/default.htm0@
    • http://crl.microsoft.com/pki/crl/products/MicTimStaPCA_2010-07-01.crl0Z
    • http://www.microsoft.com/pki/certs/MicTimStaPCA_2010-07-01.crt0

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0001c020.bin
30f8a879ab7c04780325d3beacf9a5d0c32d39c9228071d6b27e45a29267738c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1C020 73792 bytes

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