Malicious PDF — malware analysis report

Static analysis result for SHA-256 721156c74c82d861…

MALICIOUS

PDF

56.8 KB Created: 2020-08-29 12:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f58772b4b77719de743cc849059b22 SHA-1: 3ae197f9946bba22a41e33891e5e57833707f3b1 SHA-256: 721156c74c82d861b309ae453060c31cdb76f503dbc7bb0211d8e238131297ff
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to a redirector infrastructure. The primary malicious URL identified is `https://ttraff.club/wix?keyword=bonavita+sheffield+crib+instructions`, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF files, suggesting a link farm or SEO poisoning attempt to drive traffic to malicious sites. The ML classifier strongly indicates 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.club/wix?keyword=bonavita+sheffield+crib+instructions
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_c3f3873bd5d94985827907ad64daa3e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_588d24831d0d4f7ca37ccbc5fb22e7ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7603f3b730b4ec0a5627ef94f09ea5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_d8db61c4f5e14e4f851e78469309912c.pdf
    • https://static.usrfiles.com/ugd/b8c837_064131a5b1c94eb388e4fc0ecc63037f.pdf
    • https://static.usrfiles.com/ugd/b8c837_851baff641eb4b899db27318279ad8b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_db8c6c37836142628832b224ca873684.pdf
    • https://static.usrfiles.com/ugd/b8c837_7749e4e019894db19f760c4fb37cd163.pdf
    • https://cdn.shopify.com/s/files/1/0431/3278/0695/files/volumixubarinenozis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6924/3549/files/bikifitigigusasusojugotor.pdf
    • https://cdn.shopify.com/s/files/1/0435/6145/1681/files/adobe_reader_scan_to.pdf
    • https://cdn.shopify.com/s/files/1/0431/2861/9168/files/tulomukedibewusuluvo.pdf
    • https://static.usrfiles.com/ugd/b8c837_40a453eaa689443c9fd4749d3652104d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf320dace5ef4899b94c0e7b89ca9479.pdf
    • https://static.usrfiles.com/ugd/b8c837_988bedc97cdb49f8883d70279d691a8f.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009589.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9589 2828 bytes
font_01_sfnt_off00009f84.bin
e3dfe948b976678050477448e0f815b3ab997dc956cb82e404d59f5cec2f2ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F84 5360 bytes
font_02_sfnt_off0000b1b5.bin
6784f5342bbd297cea7c1efad551754c5e0bc420d002a2c5c5c796e82950d0f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B5 10624 bytes

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