Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55f0bc095a513af…

MALICIOUS

PDF

43.6 KB Created: 2020-08-29 01:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a176fb0a8af7f25de7f543420bd3a63 SHA-1: 575794ccb3f267204e40e57941820934f35962e0 SHA-256: a55f0bc095a513afa92057b2ff796334dfca047bb64343df53fe0c2297613f4a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary heuristic indicates that these links are part of a link farm designed to direct users to malicious infrastructure. The document body, though heavily obfuscated, contains the suspicious URL. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.cc/wix?keyword=stoa+speech+and+debate
    • https://static.usrfiles.com/ugd/b8c837_12985fe92d964c679b808b2fc07d15e6.pdf
    • https://static.usrfiles.com/ugd/b8c837_c69a25be5569414c8ca8b10054670f96.pdf
    • https://static.usrfiles.com/ugd/b8c837_964d35a497eb428086be5af45f294145.pdf
    • https://static.usrfiles.com/ugd/b8c837_1866dd4e82ba4919bbc9956aab0c2f54.pdf
    • https://static.usrfiles.com/ugd/b8c837_28c6af17d4ba43b6a144aaa7ea1ae9a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_cac89a27fce747b0a6f67eab3ad22d83.pdf
    • https://static.usrfiles.com/ugd/b8c837_24a2109d6d6a4ef2a82f3fb2642d547c.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ed2aaded1c3425d813f5387c4679206.pdf
    • https://cdn.shopify.com/s/files/1/0432/6332/8411/files/47007019991.pdf
    • https://cdn.shopify.com/s/files/1/0432/8764/2270/files/cortinarius_violaceus.pdf
    • https://static.usrfiles.com/ugd/b8c837_76925b519f274fabb3e97b08dfb613a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_9442942980d449109f7e8df780c43b35.pdf
    • https://static.usrfiles.com/ugd/b8c837_79014978337143ef8aa256f3ebac420b.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceb9385c38a94f67ae156edaa31c7a55.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_off00006cd8.bin
979e9f579dcf9d55b5c07ab63555f8b0db1748025108967fee4c8f2ffe8c10a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD8 5276 bytes
font_01_sfnt_off00007eb6.bin
b4b38dd1975f30250895dba730a7d82866d71abd273c26644ff2e658347bcc5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB6 10288 bytes

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