Malicious PDF — malware analysis report

Static analysis result for SHA-256 b47155c36481d9a1…

MALICIOUS

PDF

43.5 KB Created: 2020-08-29 17:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77356707d72b235f4b8aba4b628493d2 SHA-1: 437e62b72db03a4b6dd9c7f790e6e236fc846a3d SHA-256: b47155c36481d9a1bc6f61a3a3a597a4ae313bbfb2b6c49b0aa3686c7cbc27b5
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=is+cl2o+polar+or+nonpolar, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a social engineering tactic to drive traffic to malicious infrastructure.

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.ru/wix?keyword=is+cl2o+polar+or+nonpolar
    • https://static.usrfiles.com/ugd/32acb1_03fc63b92e984866848d1b611e5e7f75.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc3593a299b44a2798f240f0b686a572.pdf
    • https://static.usrfiles.com/ugd/b8c837_8a44d33fef1f417bbe83dad1b0e20e91.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/plant_biotechnology_in_agriculture.pdf
    • https://cdn.shopify.com/s/files/1/0430/8067/9577/files/chevrolet_captiva_manual_bekas_bandung.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/45949540382.pdf
    • https://static.usrfiles.com/ugd/77d535_8f3d339650534e9cbdb9d755de16c518.pdf
    • https://static.usrfiles.com/ugd/b8c837_b807141955ef4b10b45a1f6f3750c3ad.pdf
    • https://static.usrfiles.com/ugd/b8c837_bfa3c3610ba742a2be88244e439d246f.pdf
    • https://static.usrfiles.com/ugd/ecec20_445ee57b2049430590ae1c61db8a4870.pdf
    • https://cdn.shopify.com/s/files/1/0433/5380/0859/files/61364863602.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.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_off000063ca.bin
9f444605cc227ff8abf4edb5263cf49b9d63b9680bae8c65c9e6e87355da1837		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CA 4996 bytes
font_01_sfnt_off000074cc.bin
8680edbe0e75990470599d7851e69e93730be24ab07cf57d9746e8befe80d60e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74CC 14608 bytes

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