Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21944b61981c696…

MALICIOUS

PDF

51.2 KB Created: 2020-09-01 00:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d78ae780a477eb614e765241086f6e5c SHA-1: a3f742edac8c9c5fc46a17bcfb0a135ca72d8a7f SHA-256: b21944b61981c6968d61950a7a769e7d66e7bd656deb011b412e98d48f1e0434
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious sites. The PDF also features a link farm with numerous external links, many pointing to cdn.shopify.com and static.usrfiles.com, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly indicated maliciousness.

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/pify?keyword=living+style+guide+generator
    • https://static.usrfiles.com/ugd/de65f7_02bcb7bfe3294d8293ebbfba00af0705.pdf
    • https://static.usrfiles.com/ugd/9e53d4_84032e22609243609c2a8e90ef345bf2.pdf
    • https://static.usrfiles.com/ugd/c63dba_61287e07b9c441a9b12b6c34be569ed8.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/greenland_ice_sheet_map.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/clinical_guidelines_for_diabetes_type_1.pdf
    • https://static.usrfiles.com/ugd/85d67f_0cd7e3548e2846b4878fd96082136016.pdf
    • https://static.usrfiles.com/ugd/4b7290_eca0e41ad0684a56a776f2e4f0d8d5ab.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/nowebux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/fexuzif.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/lewom.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2817/files/characteristics_of_effective_information_system.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_off00008ce4.bin
1e13e484f9fea9a6a9f3ffe1ce936bd71e4c5130dc14f95c9ec88583333dbcce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE4 5096 bytes
font_01_sfnt_off00009e5d.bin
7639dcf1eb469f59a0f7be46981dfa48849e7325392d62723481fe376a8ec5be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E5D 9900 bytes

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