Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef89adfdf5884b4…

MALICIOUS

PDF

44.4 KB Created: 2020-09-18 09:38:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73c14d2e323b316d67eb227f3a4fec6a SHA-1: 729d9cd94c89b5f412d1e23cd8b22b5e563d2e6f SHA-256: 5ef89adfdf5884b4b5d2f61be8983b38db78feac970de03f69e8f9e0df4790b3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, also contains URLs. The presence of a link farm and a malicious redirector strongly suggests an attempt to lure users to malicious sites, likely for phishing or to download further payloads. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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.link/wix?keyword=tailoring+leveling+guide+legion
    • http://vabomomob.justaskmigration.com/uploads/1/3/0/7/130739802/jevonomofefofi-wilutovogamofat-sezef.pdf
    • http://devat.tfadfw-resumehub.com/uploads/1/3/1/4/131483083/06231.pdf
    • http://ratakapef.developinganaesthesia.org/uploads/1/3/0/7/130775448/fuzaluzatigo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0aa41506-4cae-4434-8412-0c5677515f21.filesusr.com/ugd/b88e3d_bca1d05ed90a40f0bc31f1801bca4e1e.pdf?index=true
    • https://b54194ce-7dbf-4564-8eef-ac135a90625d.filesusr.com/ugd/694d5d_1ca6893445524709966fefe43de6b9c7.pdf?index=true
    • https://1a5ef426-f608-4336-bc65-1a4708071dfd.filesusr.com/ugd/f390e7_cbef186299d64a9fa19805ed31157284.pdf?index=true
    • https://74ef23be-8859-4440-bfa8-d1c2917c4c92.filesusr.com/ugd/3bbd68_5bd2b7ba3c2948a792d68da5bc588fa3.pdf?index=true
    • https://e87c28a7-63b3-4c21-9ee6-1a39af05fd0e.filesusr.com/ugd/54fa57_b7157c9cd0f64c4d8093c36cab781e30.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/90847992588.pdf
    • https://cdn.shopify.com/s/files/1/0440/5955/8053/files/vojimavibej.pdf
    • https://0a715787-451f-4c11-9e25-50c8a99ff7f3.filesusr.com/ugd/d2751c_bb2fade46d0f417397e027746d2ee124.pdf?index=true
    • https://900107c1-caf3-42ff-b758-4ffb6c9a3ca5.filesusr.com/ugd/f459ea_2b7f2394246b4c059bd16a662aa89c4a.pdf?index=true
    • 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_off00007149.bin
c1c2ebae1897c2b8f24c93d41bfd41618bbae99b36b9712fa3e506dad0fa0880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7149 4824 bytes
font_01_sfnt_off000081c5.bin
695a6a53a88db7039b29251826ef4c4336918386366d01e60a68b10417358c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81C5 10336 bytes

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