Malicious PDF — malware analysis report

Static analysis result for SHA-256 45900fd75b6e4b44…

MALICIOUS

PDF

41.9 KB Created: 2020-08-30 00:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6cccecd0c6d27fcad58faead5946bcb SHA-1: b50641662e58b3672d4a8f5dc1d47369014a42b1 SHA-256: 45900fd75b6e4b44944193cfafd624943fc6ef9970773809257f02f66be9ee99
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a significant number of embedded links. One critical heuristic indicates these links point to a known malicious redirector infrastructure, specifically 'ttraff.club'. Another heuristic identified a large PDF link farm, with many links hosted on 'static.usrfiles.com'. The document body contains garbled text but includes the URL 'https://ttraff.club/wix?keyword=botw+armor+set+bonuses' and several shopify URLs, suggesting a lure to external 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.club/wix?keyword=botw+armor+set+bonuses
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/vadewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1908/3677/files/fairclough_critical_discourse_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/pafezorujuremalup.pdf
    • https://cdn.shopify.com/s/files/1/0437/5897/7178/files/kindle_reader_for_android_tablet_free.pdf
    • https://static.usrfiles.com/ugd/b8c837_94e15fad5e8d4bf5bb00b762395d5e4e.pdf
    • https://static.usrfiles.com/ugd/c7a620_e959f81892b84da9a29cafc4c12ea108.pdf
    • https://static.usrfiles.com/ugd/b8c837_11734de3b77c411581461eb84533a23e.pdf
    • https://static.usrfiles.com/ugd/b8c837_f473a4c9cbd24e5c98d85ae586332a7d.pdf
    • https://static.usrfiles.com/ugd/166c09_2d6cb695cbb44be699c74b22e5054ff8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0abbcbbff42644c4a10cc8ae1872525a.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce9be25263ae42d2b74b1bbd6293a363.pdf
    • https://static.usrfiles.com/ugd/8b9728_cc0e9bc58e624bc18515e28ebd1f63b3.pdf
    • https://static.usrfiles.com/ugd/c63dba_8b75c6f507954ec6aa58ef101572c55d.pdf
    • https://static.usrfiles.com/ugd/3fc21f_0040b7d07d53431ab556fb7123c5d7f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ead4e8c8306479ab4a774814528b582.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c0dfbb803454a58ae86d92512682165.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_off0000673e.bin
81ccc3a73a4afe03b9300bab15863c1901e478ec2f842a9c2da6ba2dcd00c7f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x673E 5080 bytes
font_01_sfnt_off0000787e.bin
74164451c65f82cebf156c1cf9c5bcf38428a32fd10e544cfc9b5a3ca1a2bc07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787E 10092 bytes

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