Malicious PDF — malware analysis report

Static analysis result for SHA-256 4219c1aa8d92e947…

MALICIOUS

PDF

47.6 KB Created: 2020-08-31 11:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6370910f877a61124fd2f8ecc230732 SHA-1: de5abc80a293ab837bcf4854d7febc41020318e8 SHA-256: 4219c1aa8d92e94744b5236e7e041c89a63867dc99c193b4b35990261e0be3b3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=arcane+disciple+3.5'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of external PDF links, characteristic of a link farm, with 'static.usrfiles.com' being a dominant host. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.me/wix?keyword=arcane+disciple+3.5
    • https://static.usrfiles.com/ugd/b11f6d_cfc744849eeb45109c1b9f4d004738d9.pdf
    • https://static.usrfiles.com/ugd/5e81b9_0c5d54d66f8d4c0a9f2df773ad06b5c9.pdf
    • https://static.usrfiles.com/ugd/432b07_0991f830c9854a0ea11d5b368d906fd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3ae09e087aa487a9991ec7759c3ef61.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6789/files/25970714260.pdf
    • https://static.usrfiles.com/ugd/405339_5f373f0785ab4195a3e6f7b270a44270.pdf
    • https://static.usrfiles.com/ugd/de02f3_67abce7fff5b461ca8f30f0cedb74ba3.pdf
    • https://static.usrfiles.com/ugd/b8c837_714e8b6834044b54b35d2edd40928b03.pdf
    • https://static.usrfiles.com/ugd/516793_d8b0d2943605436aa4a56c0ea520ea03.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8543f49da794d3c97b79c8ee397ac57.pdf
    • https://cdn.shopify.com/s/files/1/0431/4526/5318/files/98174872927.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/37162292351.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007a1e.bin
97f8d3a01f011531303971dd337a34d65d11cff81c0cc8e5a9a233a1e625259e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A1E 5376 bytes
font_01_sfnt_off00008c6a.bin
4134cbd68792666d1061cbbe7cf49dc0655ef3d5ae209eb2cebe874297b194cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C6A 11056 bytes

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