Malicious PDF — malware analysis report

Static analysis result for SHA-256 df532015c38ddf23…

MALICIOUS

PDF

43.2 KB Created: 2020-08-31 18:42:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4915e61c2b96e53cfc1a61e7b313790 SHA-1: bfb4a45c665f93902d3b5c7bc500200a3d7b7e4b SHA-256: df532015c38ddf23538d0ae122d66287b42dfb43429ecbf253970fb311549192
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF SEO link farm, with numerous embedded links pointing to external PDF files. The primary malicious URL identified is https://ttraff.com/pify?keyword=link64+video+er+ultimate+standard+1, which likely serves as a gateway to further malicious content. No scripts were extracted from this sample.

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.com/pify?keyword=link64+video+er+ultimate+standard+1
    • https://static.usrfiles.com/ugd/d216cb_dd8763420b9a4c7183c8a95f8ccf5ce2.pdf
    • https://static.usrfiles.com/ugd/345929_4aab46f8b126464cb003d6ec0d1f05bb.pdf
    • https://static.usrfiles.com/ugd/314c35_a25d5cc5589b40029e526584062510dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_5e6333fde115463baf936e1963757dc0.pdf
    • https://static.usrfiles.com/ugd/24853a_688983a5d66d460d97c54a2dc34bb236.pdf
    • https://static.usrfiles.com/ugd/f3ecbe_65327a5ddb4a417f9b547732070caa84.pdf
    • https://static.usrfiles.com/ugd/451461_c59263a35c574af1bade15920bf6b9ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d344323bb46cabc741122bd7c87af.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad9832d2efd24c09924b5cce1a436411.pdf
    • https://cdn.shopify.com/s/files/1/0430/8949/4177/files/8796096470.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/lagutidirirejegixafopogo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/2126306312.pdf
    • https://cdn.shopify.com/s/files/1/0435/4582/1333/files/tinaped.pdf
    • https://cdn.shopify.com/s/files/1/0433/3853/0965/files/export_ssrs_report_to_programmatically.pdf
    • https://cdn.shopify.com/s/files/1/0428/2816/9375/files/3927463340.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/fibagaperarofolodimokude.pdf
    • https://cdn.shopify.com/s/files/1/0431/3923/5997/files/dojix.pdf
    • https://cdn.shopify.com/s/files/1/0432/3295/2477/files/authority_letter_format_for_sales_tax_assessment.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_off000069a4.bin
96234b1b5774f3c363950b4c7bc4e170e9e3c768d80e7a5a5595910b4b19aed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A4 5328 bytes
font_01_sfnt_off00007bc4.bin
9d1c780a1fbfea64c33f10257e320eb16a0fef45e1defc590115ade0826845ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC4 10364 bytes

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