Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6720ed4f9434be…

MALICIOUS

PDF

60.5 KB Created: 2020-08-29 23:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe06c6618a97c8c3c4cb186fedd268c4 SHA-1: 8b4835d34cadf77e31f78c02b5f999fb85a0d13b SHA-256: 5f6720ed4f9434be7220d36f2a8b629ddbc96c8ede42daa851b7fd650e35ffd9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by an ML classifier and contains a large number of embedded links, many of which point to external PDF files. One of the primary links directs to a known malicious redirector infrastructure, suggesting an attempt to lure users to malicious content or phishing sites. The document body itself is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf.

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.com/wix?keyword=libro+administracion+de+sueldos+y+sa
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/07e02c_aa3ba41ebdd94dbeb24ad636feafb42a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d68c0965a14c4a3083f3c9f0077d06fc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1cd3d2001f3f4b24a3b17dcfecd18bb8.pdf
    • https://static.usrfiles.com/ugd/b8c837_258a96fa30bd41219800a6511a5ec1bc.pdf
    • https://cdn.shopify.com/s/files/1/0436/0660/5987/files/33982018325.pdf
    • https://cdn.shopify.com/s/files/1/0435/5037/6100/files/63384457529.pdf
    • https://cdn.shopify.com/s/files/1/0436/1371/6643/files/zomonizuzodiluxij.pdf
    • https://cdn.shopify.com/s/files/1/0432/8072/8224/files/vevogubuzetu.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/73178277169.pdf
    • https://cdn.shopify.com/s/files/1/0435/3097/7431/files/fosojasajajinutivatojibe.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_off0000a4d1.bin
0668317af22231f4770d3b6207b09232ddd74208eeb64db92ffa994bcec5b578		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4D1 5268 bytes
font_01_sfnt_off0000b69e.bin
61f54cef5b260e72e0114ba2ce43f6b552af91bb190fb0dff0d7f07593d682de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB69E 15188 bytes

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