Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f08725eafa7431…

MALICIOUS

PDF

68.6 KB Created: 2020-11-22 04:45:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 6564dbecb66e607d6f88a7faecaa32c3 SHA-1: d8d5c889db3ef8039f985ba92a4c06888e17e8c4 SHA-256: 20f08725eafa7431a7caef6ed09ac7aa4724ba5a995f8fd11c3df602d7571dfa
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=accrued+expenses+income+in+balance+sheet In PDF document text
    • https://xazunavawotop.weebly.com/uploads/1/3/4/7/134724639/d9868dea02d45e4.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/9373972.pdfIn PDF document text
    • https://biwazasidatuf.weebly.com/uploads/1/3/4/3/134373857/doremuzozi_zegijewenoxa_faman_vazunaf.pdfIn PDF document text
    • https://besavikeneg.weebly.com/uploads/1/3/2/8/132815808/tefukumibo.pdfIn PDF document text
    • https://mamexobupelo.weebly.com/uploads/1/3/1/3/131383482/dadivi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f873cbd01e35.pdfIn PDF document text
    • https://xuxewisi.weebly.com/uploads/1/3/4/2/134235501/gabipetofofod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393181/normal_5f908ff49232a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5fa7835ec8ae5.pdfIn PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/5331339.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/kelageketisefuv/free_attention_to_detail_test.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/dikivikimefumutebiduv.pdfIn PDF document text
    • https://s3.amazonaws.com/takeju/2195728578.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/lugezibezi.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_off0000cede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDE 5508 bytes
SHA-256: fd2e1178cfec5d1b23d04e3b03d2dfcbb1a982b0d690aebcaf475b8c7be2cf81
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 10480 bytes
SHA-256: 937002075d545e3c02f1e9d66b5c6dd8c3f997f377389c73b24029d05a79b8b1

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