Malicious PDF — malware analysis report

Static analysis result for SHA-256 33677b6f3c50e20e…

MALICIOUS

PDF

53.8 KB Created: 2020-10-01 19:50:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2c30a912bce562dd3dfe24670c914b8d SHA-1: 9431046c13b26ebe4c65ff428a5a4547fabf098d SHA-256: 33677b6f3c50e20eaf180def8cc0de927edec92455e4f49bf08f71c14558c80f
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/strik?keyword=normas+de+auditoria+interna+imai+pdf'. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious URL within the document body strongly suggests an attempt to lure the user to a compromised site, likely for further exploitation or credential harvesting.

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.
  • 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://cctraff.ru/strik?keyword=normas+de+auditoria+interna+imai+pdf In PDF document text
    • https://site-1038857.mozfiles.com/files/1038857/sivixoxebi.pdfIn PDF document text
    • http://files.rozannaartist.co.uk/uploads/1/3/1/8/131856333/bopakasolew_vifaniz_vivatativuwudit_mibamusexawugal.pdfIn PDF document text
    • http://files.sactownappraisals.com/uploads/1/3/1/6/131606188/82476ca.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7406/3002/files/duxeloriwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6057/5899/files/42112319741.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9141/8518/files/star_wars_lightsaber_form_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/7047/5419/files/vadets_workbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6598/2632/files/lumebuworofixifugejinijop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4fbf16-4184-4a77-a8b1-12ce33cbff9b/52878617997.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbc4646b-3085-4922-858d-f057d6cc5aa0/86790098857.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9392 5124 bytes
SHA-256: de67b668573e1b99b4a79392896bc26b458d3f5b5bd860083bcb6180cd1dfe37
font_01_sfnt_off0000a4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4E6 10972 bytes
SHA-256: 974a700145de06b59999285e7359d948bf927470a0337edacaf83619549561bc