Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdc4ae1d10600a8…

MALICIOUS

PDF

62.1 KB Created: 2020-11-30 21:45:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 83f3f9def73e18d2ea98545e5030acba SHA-1: 1993dc5928ba98f2b1c00bd5fed509a1a074fc98 SHA-256: ecdc4ae1d10600a8613f97523c4bf8983252ce44c5f9f927298a7eca3a40ff10
214 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/123?utm_term=haier+portable+dryer+not+spinning'. Additionally, it exhibits a PDF link farm heuristic with 26 external links, suggesting a coordinated effort to distribute malicious content or phish users. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cctraff.ru/123?utm_term=haier+portable+dryer+not+spinning In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385422/normal_5f8f76311fff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391015/normal_5f9b1617bb5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f9a484e32f46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_5fa3c40656d1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412757/normal_5fa41fc59852e.pdfIn PDF document text
    • https://nesiritu.weebly.com/uploads/1/3/4/6/134612540/4196076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383797/normal_5fc173105d101.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5f97a90e5443e.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/samopakamefap/51071909817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd62c1bd-1fa6-417c-a3f2-6e7095fa5c98/recetario_de_sushi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25032c90-3877-44eb-ac30-77cf2044517a/the_outer_worlds_game_system_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/32724828157.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/34418584209.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_off0000b7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E9 5328 bytes
SHA-256: 9501d219d3a3c98b1f4126cfd87e6e9644cc89f3c315fe81a66cfb67d157f6b7
font_01_sfnt_off0000ca10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA10 9968 bytes
SHA-256: 2b357bb229e2179d5a593779f2e8e594790f604fda3b63d8a5735c84384ebc71

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