Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ca74fcc559801b…

MALICIOUS

PDF

48.0 KB Created: 2020-10-30 15:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9ce325d8c03b3547a8bc150d529ecc75 SHA-1: 610be367a3da4b0962ce6842d59051314445145f SHA-256: 59ca74fcc559801b73677fe07b102793da20895142da229d1822ee8d3ee4fdee
154 Risk Score

Malware Insights

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

The PDF contains a link farm with 13 external PDF links, including one pointing to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs suggest an attempt to direct users to potentially harmful content, likely for phishing or malware distribution.

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://ggtraff.ru/aws?keyword=lista+de+correos+electr%25C3%25B3nicos+de+personas In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380210/normal_5f8d4c31a7ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380209/normal_5f9832494c191.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/bugutaj/bifexolofiluja.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/lord_of_the_flies_comprehensive_test_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/buwexajofavitaposukewod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5815/0046/files/weripo.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/bailey_and_love_26th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/belopudevuzuza/malayala_manorama_news_paper_file_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c5855c-2f4d-4140-9969-fe45292b1038/tovewizadafufesupemuk.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/adjetivos_y_pronombres_posesivos_en_espaol_ejercicios.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/7713/8069/files/53679495499.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/72410619176.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/academic_achievement_motivation_scale.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_off00006e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E68 5144 bytes
SHA-256: 1a8bcd58675346d48c380fccff52a82050a3ef29fe12aa34fd827ca25a252c3a
font_01_sfnt_off00007fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB1 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000883e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x883E 12304 bytes
SHA-256: 0f6d23d3b1ad8bddd65dd0cc38fb49f5e4a3aca9616fef58caf330178542bd4f

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