Malicious PDF — malware analysis report

Static analysis result for SHA-256 7937e5c0dc5a8505…

MALICIOUS

PDF

43.4 KB Created: 2020-08-29 22:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d97c88863d51b372b5ba93a585e6bb SHA-1: cba8aaf7dc121e92fd52c7d0016d2b6e6d1fa658 SHA-256: 7937e5c0dc5a85058e49802cd4e8687932211aa50bd1b6b20c3b740425a251d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it directs users to malicious infrastructure. Additionally, PDF_SEO_LINK_FARM suggests the document is part of a link farm, likely to improve search engine ranking for malicious sites. The embedded URL https://ttraff.cc/wix?keyword=goudy+old+style+fonts is the primary indicator of malicious intent, likely serving as a redirector to a phishing or malware distribution site.

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/wix?keyword=goudy+old+style+fonts
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_23ff7ac0614c439492cf69df7c255c09.pdf
    • https://static.usrfiles.com/ugd/b8c837_980e1393dd6346279d5be4732cd1654f.pdf
    • https://static.usrfiles.com/ugd/b8c837_7623674079ae4d38a386c18a331a61c8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1af16ffb28e6454c916cbb9a6fc20157.pdf
    • https://cdn.shopify.com/s/files/1/0457/6342/8516/files/31712750594.pdf
    • https://cdn.shopify.com/s/files/1/0460/1063/0311/files/invoice_packing_list_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/felimirenavutege.pdf
    • https://static.usrfiles.com/ugd/804ff6_9a70cd7a854f4357ac5fbefbda5d483e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a16243ebcdbd4868bbc87085dd1323c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc105667636b409cac439df943fa0c99.pdf
    • https://static.usrfiles.com/ugd/b8c837_72ce9d8498b841539ece29581a757d95.pdf
    • https://static.usrfiles.com/ugd/b8c837_476e506ee621455a999c44bbb08bdf8b.pdf
    • https://static.usrfiles.com/ugd/b8c837_258c5ebfe2f44e61ae08dfc4b160009d.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5c2cf93c6d043be8a06f2c6d6083b17.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1ffb517261f4ccfa867406991f5cb14.pdf
    • https://static.usrfiles.com/ugd/b8c837_70f9ce520134488e9354ec16ff51e0e5.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d65.bin
c08e386d53b8b60657f4081cdc3ecce963d766da167026dfdb42fb73a10e2c60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D65 4728 bytes
font_01_sfnt_off00007da3.bin
09aaed99bcf5d334a3edfc9198996ca566076400e0bea18ebe1d5efc99011fd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DA3 10188 bytes

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