Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab428e92f58635…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 02:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2bddc2016a8d3fb5c62f4b9ac1a04f52 SHA-1: 125e974a16cab2a3db336e119201d0d137f8dd12 SHA-256: d6ab428e92f58635611fcab8faa15f76e87752c044b7aedf4dfbc1c25bff4440
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/wix?keyword=urrea+herramientas+catalogo+2017+pdf', is the primary indicator of malicious intent. The document also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting an attempt to broaden the attack surface or engage in SEO manipulation for malicious purposes. The ML classifier strongly supports the malicious verdict.

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=urrea+herramientas+catalogo+2017+pdf
    • https://static.usrfiles.com/ugd/b8c837_41739e46bade405d8169c1762424a5e1.pdf
    • https://static.usrfiles.com/ugd/e1d12c_87d921de97a24cf0a5c09a7cdd28d043.pdf
    • https://static.usrfiles.com/ugd/b8c837_f27b1b26760645159a8becefc4c798b6.pdf
    • https://cdn.shopify.com/s/files/1/0434/0239/5813/files/dejasutoza.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0047/files/books_to_read_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/9978/2309/files/gisuburawomudokag.pdf
    • https://cdn.shopify.com/s/files/1/0440/2737/9877/files/deep_learning_book_bengio.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_f214cd970d634ca69ff74da9b6ee250c.pdf
    • https://static.usrfiles.com/ugd/e1d12c_86906bd97c904e93afe3b0dd05512a5d.pdf
    • https://static.usrfiles.com/ugd/0049ca_a4ef2b9972554baca815fc9f270be44c.pdf
    • https://static.usrfiles.com/ugd/b8c837_64ccf810d82c4e95b00fd7b0f7cf879f.pdf
    • https://static.usrfiles.com/ugd/b8c837_5b0760ebcf8242cf9a594d4b66f2709a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000056c5.bin
2d21b0291346622226a8a0b8d88ca9be8c184bdb3b9af6134227fc08ecfbe11e
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C5 5752 bytes
font_01_sfnt_off00006a36.bin
07999930995b3973eb156bf83c404c09162ce5b2a78cef79a4e8f48dbb9a1ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A36 11300 bytes
font_02_sfnt_off00008eff.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFF 4324 bytes