Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f12dc436f7fd8c…

MALICIOUS

PDF

42.7 KB Created: 2020-09-09 03:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 009be874da205608197470630d1851bd SHA-1: ae8959f2d5330bf66685902199c017ee62bbf585 SHA-256: 75f12dc436f7fd8c274d53c0ae6147b221660505e0af0adcd5c4a61ae4ad93e0
154 Risk Score

Malware Insights

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

This PDF document contains numerous links, including one pointing to a known malicious redirector at "https://ttraff.ru/wix?keyword=ash+vte+treatment+guidelines". The document body, though heavily obfuscated, appears to contain similar text, suggesting a lure to disguise the malicious intent. The presence of many benign-looking PDF links is likely a tactic to obscure the malicious redirector within a larger link farm.

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.ru/wix?keyword=ash+vte+treatment+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4977/1430/files/aha_statin_guidelines_2013.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2231/files/political_cartoon_analysis_worksheet_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0438/4158/5314/files/2751784337.pdf
    • https://cdn.shopify.com/s/files/1/0460/1869/1239/files/zipovagoxurepi.pdf
    • https://cdn.shopify.com/s/files/1/0438/8116/9051/files/books_and_authors_list_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8144/9118/files/positefebaludevaxukag.pdf
    • https://cdn.shopify.com/s/files/1/0429/0209/3987/files/24774128765.pdf
    • https://cdn.shopify.com/s/files/1/0448/0283/4594/files/sample_acting_resume.pdf
    • https://cdn.shopify.com/s/files/1/0438/1615/7344/files/mastoiditis_cronica_tratamiento.pdf
    • https://static.usrfiles.com/ugd/837d34_0d4f3bf9811644c2b757ccc7e9ebd78e.pdf
    • https://static.usrfiles.com/ugd/d54300_e38f4b7c8491473b911e16223cfb5917.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_off00006a51.bin
7cd8a59a71c4f51f00e9f772cab4b795cf4a715e3adc018892059420e1835b23
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A51 5288 bytes
font_01_sfnt_off00007c29.bin
5a50d774346ba9d749e402ae256f9c07fcd861a7fa04bd67f1b5234a75024fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C29 10008 bytes