Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e69e781cb18c3…

MALICIOUS

PDF

136.3 KB Created: 2020-11-24 08:51:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6d765ccc17fcff02d4a705c60d9f3fe6 SHA-1: 86582dcccba731963c7352d47daca4f7c8216200 SHA-256: a99e69e781cb18c3e76f8fdb2392da027078f8f23164db1919b31485b1bf1bef
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external link farm, suggesting an attempt to lure users to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://traffking.ru/strik?utm_term=kenmore+elite+smartwash+quiet+pak+9 In PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/kixisame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/66893420-c8cd-4cae-9299-eb3022040a4c/oster_clipper_blade_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/secondary_math_2_module_8_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258a4d7b-7e13-4937-adaf-3f93d899ddaa/driverpack_solution_offline_iso_download.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/collection_in_java_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nazekisigiduz/frozen_2_putlockers_cam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb2b34f7-48fd-4274-9110-07a733e8cfe0/acentos_en_espanol_teclado_laptop.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/dazabaferewe.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/tattoo_artist_biography_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/nujedoxina.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0F6 5464 bytes
SHA-256: e37cb005112801c704ca536280ade8ed19bc6935208f9c0eadd119f1a02edafc
font_01_sfnt_off0001e369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E369 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0001ebf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EBF7 11780 bytes
SHA-256: a48b8b8f818b4d5443aba08f2c5328d2f7a071b9830b27da432ab96b8ddfbec4

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