Malicious PDF — malware analysis report

Static analysis result for SHA-256 739d773c351c7446…

MALICIOUS

PDF

52.2 KB Created: 2020-08-31 10:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21e2ff4895c56d25e605fffa71451979 SHA-1: ff5a252001500ce7a97228d7380dd5d4b1affcce SHA-256: 739d773c351c74466f310e8bd309bdc3f4acf6b408624c020100b71b81db06be
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=behringer+ecm8000+user+manual'. It also exhibits a PDF link farm heuristic, with 28 external links, many of which are generated SEO-style PDFs. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious 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=behringer+ecm8000+user+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/48f461_4034e7888c3944d89768cc489e636cf1.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a47dd4cf294d779d6dabce7d3e3b7a.pdf
    • https://static.usrfiles.com/ugd/3f80ec_925553640e104357ac60473d543f2314.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9662/files/flowcharting_template_ibm.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1175/files/69365034062.pdf
    • https://cdn.shopify.com/s/files/1/0437/8719/0430/files/61655109724.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/94722602347.pdf
    • https://cdn.shopify.com/s/files/1/0432/8649/5397/files/46170998508.pdf
    • https://cdn.shopify.com/s/files/1/0429/4357/8278/files/application_form_for_nursery.pdf
    • https://static.usrfiles.com/ugd/69b86f_2bbaa2471f734efa81116f9905dad8cf.pdf
    • https://static.usrfiles.com/ugd/8b9728_120de7a3bfb74f1a86676803722430d7.pdf
    • https://static.usrfiles.com/ugd/87b9a8_05f39084ad8b473fa169a6fbbd3df782.pdf
    • https://static.usrfiles.com/ugd/f459ea_be90be6fa81948978e266e12c16bf6a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_41e8145f2cca49a898bf42a3af490ec6.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_off00008bf7.bin
f74aaffa8c2ec5014297fc7c3bbb17284201db199c3b85dd09bae20556e047e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF7 5600 bytes
font_01_sfnt_off00009ecb.bin
211901cc4cc3514b26b9fc3d2080239c5c089b0e3b55f3b18be0d963f3905595
pdf-font-stream PDF embedded font (sfnt) at offset 0x9ECB 10808 bytes