Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dd096c1034bb0f…

MALICIOUS

PDF

38.5 KB Created: 2020-10-27 22:43:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d412d09bdfe74353e3bf268c173d5efa SHA-1: 95bc4e787642622e5ced332164dc87a1ec01cff4 SHA-256: 84dd096c1034bb0fc9efc3dcd857a1265adab0be44108278292273be3d41e2eb
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on cloud storage services. One critical heuristic identified a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL.

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://cctraff.ru/strik?keyword=el+%25C3%25A9xtasis+de+gabriel+pdf+lelibros In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5f972bd2e732a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366637/normal_5f872a6fad1f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375521/normal_5f8c83a877c90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386084/normal_5f96bb3a6f8ce.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/zetare/55638469955.pdfIn PDF document text
    • https://s3.amazonaws.com/jowutoneranemuk/14615395518.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/winebuxoselokoxum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0478/4947/2159/files/vebopojidad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7616/9109/files/zigomokavukaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2094/9403/files/66288877744.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9958/4680/files/plitvice_lakes_national_park_location.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0994/9348/files/idioma_espaol_mexico_para_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0554/2051/files/591554685.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/jozamijamor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/famitizuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/5780/5984/files/memenatetaroxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0793/4103/files/pdf_rent_certificate.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7026/7291/files/fesijefadak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9120/1700/files/chistes_malos_twitter.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2836/3439/files/daxs_fishing_guide_service.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8317/9195/files/tisege.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/related_literature_on_factors_affecting_academic_performance_of_students.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/sociology_project_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/sowewazulejewi/integral_calculus_inverse_trigonometric_functions_sample_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/xijepobik.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/tanudap.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_off0000533f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x533F 5516 bytes
SHA-256: ccc2000582d7039ca5bee0236066b8c78a6bb062365108c3f18ec8f9b01e1fb7
font_01_sfnt_off000065c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65C6 11192 bytes
SHA-256: 3fd9cf6ae787e1c4ab4c445d5eed91d10ab40194303d5426d448a6726a10de51

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