Malicious PDF — malware analysis report

Static analysis result for SHA-256 af67e714ff4779f9…

MALICIOUS

PDF

60.0 KB Created: 2020-12-25 22:16:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f6ca2955440449fe8439175ceb31e0bc SHA-1: d0752f8c50c20399cddfd5fc484a52bcaa0d07d3 SHA-256: af67e714ff4779f95c4642f7f3128e8112558efb607215ef8cb5ad08d2bd38ef
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, directing users to 'https://gettraff.ru/strik?utm_term=earn+to+die+3+exodus+hacked'. Additionally, it exhibits a PDF link farm with 24 external links, many pointing to Weebly subdomains, suggesting a coordinated effort to distribute malicious content or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gettraff.ru/strik?utm_term=earn+to+die+3+exodus+hacked In PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_5fd7dea625ce1.pdfIn PDF document text
    • https://kebotufu.weebly.com/uploads/1/3/4/7/134735966/475a62261.pdfIn PDF document text
    • https://mepowubufavi.weebly.com/uploads/1/3/4/8/134858245/2029782.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/nazavusat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/levovod/6242228830.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/muliwalajizerenilekeka.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/matogopelupudomu.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/vidmate_apk_install_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/xuzezejerax.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/l-_arginine_500_mg_free_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/mewixa.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/internal_audit_report_template_in_excel.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_off0000b1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B1 5248 bytes
SHA-256: 67c4591c0c860c441a99eee05f367a9294ab5a36d908d605e4cb6fe05f2c66a8
font_01_sfnt_off0000c38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC38A 9520 bytes
SHA-256: 8b1f264de3adde0b4768b9714c3847d09eee1d21c962ef95426a9ffd4b54a49d

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