Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b2b4df5e4576fc…

MALICIOUS

PDF

38.7 KB Created: 2020-08-30 09:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ec6d2a4c01e94afc60cc48ae8abb62b SHA-1: 9afc25e9bc457e67bc7aeeffa005b14f02a4d09d SHA-256: b5b2b4df5e4576fca9846a636bbed73de7df2cb6494fecba3398475fb2760c5b
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'Echostar dsb-646v software' and a URL, suggesting a lure for users seeking this software. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many hosted on Shopify, which is a common tactic for distributing malicious documents. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=echostar+dsb-646v+software
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/pukititewubog.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/libro_recetas_dieta_cetogenica.pdf
    • https://cdn.shopify.com/s/files/1/0435/8035/8811/files/74319889230.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_07b291d60fb143e48262f6cb9ae71b9b.pdf
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/tratamiento_nutricional_para_artritis_reumatoide.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/74570580511.pdf
    • https://cdn.shopify.com/s/files/1/0433/2630/8510/files/american_college_of_gastroenterology_guidelines_diverticulitis.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/kixakodalixanumuvutawew.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/wubifelaxuwezoxiwamatumiv.pdf
    • https://cdn.shopify.com/s/files/1/0435/8026/0511/files/spanning_tree_protocol_cisco.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_off0000584c.bin
05c74f8f994e96743e3449be1727a00b2703de9c9931e7efb4c5c1982274046d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x584C 5600 bytes
font_01_sfnt_off00006b75.bin
19d5a49495e3464a73d9f4176716ddb4f79ae838b1c03ccd503acad4c7f2eeb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B75 10184 bytes

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