Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dd5b7a81284591…

MALICIOUS

PDF

100.3 KB Created: 2020-08-30 14:39:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca5d3145a2e5c772138aab06305bca07 SHA-1: c579cc9fa48415dd80cb08b10901df18e59c421b SHA-256: 38dd5b7a81284591c557a0df0e802957f0dd7b252fe1d42830408b30300f49ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, including one pointing to `https://ttraff.ru/wix?keyword=mecanismo+de+accion+de+las+benzodiacepinas`. This suggests the primary purpose is to lure users to malicious sites. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/wix?keyword=mecanismo+de+accion+de+las+benzodiacepinas
    • https://cdn.shopify.com/s/files/1/0431/6338/6016/files/jegidomavimane.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/87657919960.pdf
    • https://cdn.shopify.com/s/files/1/0437/3980/7893/files/logiko.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/migekofizojefitupupovud.pdf
    • https://cdn.shopify.com/s/files/1/0429/1385/7692/files/niwudisumi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/kilojojabakinenel.pdf
    • https://static.usrfiles.com/ugd/bf650e_7e5bdbd42fb34b048819b819d579a93d.pdf
    • https://static.usrfiles.com/ugd/cf14a4_3fce8dfd7fbd43e2aec696336e6fce2d.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22537170944.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/midabulijub.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a0f.bin
79e575be6b96cc342014d876696aa52c41f8cf7d6b83ce9eef01ddf47b577f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0F 5316 bytes
font_01_sfnt_off00014c13.bin
a6a6b73918e219f661d2b600daf068c3c8e9047c357d6a821553913cd4e57a31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C13 18136 bytes

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