Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f565e5e0ca06b5a…

MALICIOUS

PDF

56.6 KB Created: 2020-09-08 17:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d403287c85306a7a79498390df85f5f4 SHA-1: c4e795b3d02df71cebe6d1ef58047e564194ada3 SHA-256: 8f565e5e0ca06b5aeb71abbbca932b576a12f8e38b557a2a0f5f6b3e0e962b5d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is disguised as a business letter template. The document also contains a large number of links to external PDFs hosted on Shopify, likely as part of an SEO spam campaign to improve search engine ranking for the malicious URL. 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.club/wix?keyword=business+style+letter+template
    • https://cdn.shopify.com/s/files/1/0438/9624/2331/files/badri_bangala_kathamlo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/45456895181.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/gapisipok.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/favirarowibemibew.pdf
    • https://cdn.shopify.com/s/files/1/0432/3622/9278/files/burma_tamil_movie_in_utorrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/0005/3408/files/25932633438.pdf
    • https://static.usrfiles.com/ugd/0b1cf2_fee5c8e774e74b02bdc80dda3336439e.pdf
    • https://static.usrfiles.com/ugd/40512e_c1cd1d710db1419d8376319137b815ca.pdf
    • https://static.usrfiles.com/ugd/2ca22b_ccd479ff2c934bd78ba46137172566e1.pdf
    • https://static.usrfiles.com/ugd/8acad3_3eada1be590f43048565a5562cc605c2.pdf
    • https://static.usrfiles.com/ugd/1d5a3f_6bef456988a84529aafbd6dcb3f34182.pdf
    • https://static.usrfiles.com/ugd/5cd33b_a8ccaf1231134ed7b389445899adddf2.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_off00009ffa.bin
e5c36513e393bf540985054ba2dc8f44efb6ce11751dab6052ad94c1f3e8f19f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFA 5116 bytes
font_01_sfnt_off0000b150.bin
2c8d11629982f3449db5c9a8b6aa3c4998a21502e42df5a39cd1081aa02613a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB150 10648 bytes

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