Malicious PDF — malware analysis report

Static analysis result for SHA-256 6511d2a47235ef68…

MALICIOUS

PDF

64.1 KB Created: 2020-11-20 03:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1cd81f16c9a5edd7de24999acdabad87 SHA-1: 638bc9c7241039a9b34e4bef300e5723276d2c14 SHA-256: 6511d2a47235ef68b23b1230cf0414ed79e157ca5f6626ff84e727117f2152b4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying it as a malicious redirector link pointing to 'traffmen.ru'. Another critical heuristic flags it as a PDF SEO link farm, indicating a large number of external links, likely for malicious purposes. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern involves redirecting users to potentially harmful websites.

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://traffmen.ru/aws?utm_term=functional+skills+english+level+2+workbook+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5f8d3cc4a632d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383467/normal_5fad95741b5fa.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403672/normal_5faaa88f65a6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f874b7f48049.pdfIn PDF document text
    • https://wejakoguxi.weebly.com/uploads/1/3/4/3/134324676/dekiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5fa3a8e3050b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f985b9c751cb.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/memul/phonics_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a02ecd-b1cb-448e-bab9-1a25c884cc0f/jomopaxujopowuxipu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13fb36f-b875-489c-9cf3-d60893b9d4e9/yucca_loma_elementary_school_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/36720285598.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_off0000be00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE00 5860 bytes
SHA-256: 6f97f28e66186e49c41bfbceec3f4cc1f25d54c735aa1e62aa57090e9e21d8d3
font_01_sfnt_off0000d204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD204 9644 bytes
SHA-256: fee6dd789a374ec21238eaceaf9a83a4d343289f5060cc6412319861da1ce3ce

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