Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e760fbf32e2721…

MALICIOUS

PDF

45.0 KB Created: 2020-10-26 18:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d25af586a92e004221bfb76314953c62 SHA-1: e00411563c2b5e5bc768807220b75fbb89ff69e5 SHA-256: 55e760fbf32e2721a7fe5f32eed360ccc62c024bd0d3286e126590256a2fad55
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One of the primary links, disguised as a children's craft resource, redirects to malicious infrastructure at ttraff.cc. The ML classifier strongly indicated maliciousness, and the PDF structure itself is suspicious due to the mass of external links.

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://ttraff.cc/123?keyword=manualidades+con+palitos+de+madera+para+ni%25C3%25B1os In PDF document text
    • https://riwisasivituw.weebly.com/uploads/1/3/1/0/131070703/jubugowozozun_jekupoguzewox_jotawesala.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/bonufag-zusuravufi-zepogadus-komujawosulunu.pdfIn PDF document text
    • https://lisewukalog.weebly.com/uploads/1/3/4/4/134435391/8e917479bbb507.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_5f8d86e687f75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380076/normal_5f8edd7b99d22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_5f950f6a63e60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f896eb617b8e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9441/2963/files/nouns_and_pronouns_worksheets_for_grade_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6898/3969/files/16476363682.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8509/7877/files/morcheeba_enjoy_the_ride_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/6618/1028/files/xobadipivivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9782/8760/files/rapumutidedunoxilokeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2407/5936/files/fuwaxajodo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/the_investigation_a_message_of_solidarity_destiny_2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/work_mechanical_advantage_and_efficiency_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9163/1522/files/math_table_chart.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/6766244461.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/autoimmunity_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/lucent_ecology_and_environment_in_english.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_off00006c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C44 5436 bytes
SHA-256: 68650e9e8446e42770347d6e175d3beccfee5f912143a6366d1812fc9609ca4b
font_01_sfnt_off00007e60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E60 11624 bytes
SHA-256: 97c35da0bb3b48533e49bacd038628cf7148e04c21d6022d810c68c6d66d8d96

Open this report in the interactive analyzer, or submit your own file for analysis.