Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d3b8ab4276c03c…

MALICIOUS

PDF

38.2 KB Created: 2020-11-01 22:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 84778ee497780b0b8bd1ac9065e38760 SHA-1: 78628af858eb31385fed06774b15e98488a0cfce SHA-256: 65d3b8ab4276c03c2fb8ab177fc72ca6ac5c414fad7a73110b99664e521d6ecc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a technique often used to create link farms for SEO manipulation or to distribute malicious content. One of the primary URLs, 'https://ggtraff.ru/aws?keyword=blood+in+blood+out+tree', is flagged as belonging to known malicious redirector infrastructure. While the document body is heavily obfuscated, the presence of numerous links and the malicious redirector strongly suggest a malicious intent, likely to lure users to harmful sites or to distribute further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

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://ggtraff.ru/aws?keyword=blood+in+blood+out+tree In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379612/normal_5f8c923a7d749.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368949/normal_5f88ce51dbbcc.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/1/0429/4259/5239/files/my_lamar_self_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4936/0793/files/journaux_algerien_daujourdhui.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/8905/0813/files/texte_pour_bapteme_religieux_parents.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9812/1388/files/free_phr_study_guide_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8446/2274/files/va_claim_pros_contact_number.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5031/9517/files/bobcat_zero_turn_mower_parts_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/427bcd2e-f723-45fc-adc8-1eff3ff02e62/razogogoda.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_off00005b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B37 4620 bytes
SHA-256: 4efb68d20f8384b31ecff0244d50dc15947ec15b0c9bbd99cb7a7e263ebe782e
font_01_sfnt_off00006af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF7 9876 bytes
SHA-256: efbdf02d93867e86538d2f7b3404f5e3042505efc0536bdd7276f500be5b6826

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