Malicious PDF — malware analysis report

Static analysis result for SHA-256 8df3291a0e04d7b7…

MALICIOUS

PDF

37.0 KB Created: 2020-08-29 15:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: abee7c9f6cd7a622f01fe7d79ffdea45 SHA-1: eb34707f56951f7767301ae5d81527c7c054d194 SHA-256: 8df3291a0e04d7b724630d641e38377c010db74a6b207ebba2c2938d3031d227
150 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 designed to redirect users to malicious infrastructure. One critical heuristic specifically identified a malicious redirector link. The document body, though heavily obfuscated, contains the primary malicious 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.ru/wix?keyword=sketchy+pharm+companion+workbook+pdf
    • https://cdn.shopify.com/s/files/1/0437/7041/3207/files/xegezoxova.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/61768290519.pdf
    • https://cdn.shopify.com/s/files/1/0437/7654/0834/files/sql_database_tutorial_for_beginners.pdf
    • https://static.usrfiles.com/ugd/0c41e7_c2c54f190182435abda221853784c2ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_abcc28a4d8af49968202b82dd3743905.pdf
    • https://static.usrfiles.com/ugd/b8c837_18c195f4a4f64fd790ff49a32eeea7dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_36e48f9db16d4675b41380d0fa17b36f.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e8145f2cca49a898bf42a3af490ec6.pdf
    • https://static.usrfiles.com/ugd/b8c837_a0d3364034134d359eb31f41ffd4f906.pdf
    • https://static.usrfiles.com/ugd/b8c837_98b8e68f9a124837b2e32dd7f6625552.pdf
    • https://static.usrfiles.com/ugd/b8c837_0386f3b8c84d4403ae92a649a43a33dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_7a2a6f31a632415b9c76541145582218.pdf
    • https://static.usrfiles.com/ugd/b8c837_6bf000bcea344521b0c476f2d91515c3.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_off000051f4.bin
176f1c9ab39ab4b0eefe4713b47912111d66fbd14a11d789927a2e9dae80a378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51F4 5688 bytes
font_01_sfnt_off00006539.bin
c4d6c7ea09c9c94c0bf988e3a6c06d71ff5ff391348056501c2e7765b2bc7b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6539 10016 bytes

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