Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f702598cfe327b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-29 02:50:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e1c2cb9942bf3f7474dd332fabd2d359 SHA-1: 8851c55bb5749050bb86a664c37aaf62e7751335 SHA-256: 82f702598cfe327b210b2c8a391c3e5ed6ffb939f78ef9fe292a19b423465475
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO manipulation tactic. One of the primary links, 'https://ttraff.cc/wix?keyword=cosmopolitanism+ethics+in+a+world+of', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest an attempt to lead users to harmful content.

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.cc/wix?keyword=cosmopolitanism+ethics+in+a+world+of
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_1e85c6e49114408ead775c710541af4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_dbeaf4717e1744a3a8260b2a47c49374.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0deb1a4376a435e96ca0521b9232cbe.pdf
    • https://static.usrfiles.com/ugd/b8c837_7965b7021d734b74bcf01906dc02aa5d.pdf
    • https://cdn.shopify.com/s/files/1/0439/8225/8334/files/free_download_adobe_reader_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/6318/8383/files/wuruxorugisu.pdf
    • https://cdn.shopify.com/s/files/1/0445/7719/4148/files/yahoo_mail_default_location.pdf
    • https://cdn.shopify.com/s/files/1/0434/7330/5762/files/mixef.pdf
    • https://cdn.shopify.com/s/files/1/0433/7552/6051/files/arduino_full_guide_pdf.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba81411a5788433eb5a317c500da141c.pdf
    • https://static.usrfiles.com/ugd/b8c837_95443c9a2d2045878d48648be14c63ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a0d2140dc5c485c8c0658163308a9da.pdf
    • https://static.usrfiles.com/ugd/b8c837_26b44f289cf9405e9b6eb01e7ceb64d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_81a30c15573c4d93b5b754f527edbcfe.pdf
    • https://static.usrfiles.com/ugd/b8c837_1efd6712ad2f4dc89fe8337ef8203db9.pdf
    • https://static.usrfiles.com/ugd/b8c837_286d42d3721b4a818ad156a9620b876c.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006efe.bin
9a49b71904663c8306f8b5bd0d86b228ec7437afd572e1100a73724692b7b83d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EFE 5392 bytes
font_01_sfnt_off0000812c.bin
4934eec22534c57d9b56d6e7102b666c8e76fe649911e7023d63fd8d2d9ccc72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x812C 10328 bytes

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