Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd440ce5eb7ae9f…

MALICIOUS

PDF

46.6 KB Created: 2020-10-26 16:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1a73ebf62a059fc9256709f23f5ab275 SHA-1: 443186cf5ccf7b0c664abbfeee4df977c0449e28 SHA-256: fcd440ce5eb7ae9f7a06b98614cec62b23c07f8b6c943ea0cb0deb9f31a25ddc
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to disposable hosting and appear to be part of a link farm designed to manipulate search engine results. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?keyword=wasteland+2+director%2527s+cut+xbox+one+guide In PDF document text
    • https://xitemexum.weebly.com/uploads/1/3/4/3/134311382/a6fdb9e09417.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/2501269.pdfIn PDF document text
    • https://fotejisatowonu.weebly.com/uploads/1/3/2/3/132302873/5fa697e5b.pdfIn PDF document text
    • https://loneluripovulom.weebly.com/uploads/1/3/4/3/134364014/955ef222167.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/3703292.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/5d9db5c2-eaf0-4525-8533-9e55a36d7b72/50_tons_de_cinza_livro_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d872fe51-2d99-4987-9a9d-33cfdcdc58b9/wonazuxozuve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/234fee32-a149-4130-abd5-71837b3a72d0/65300736232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/219c9c6d-355d-4c94-919e-594d0304b456/lorirududedixe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bbd9aac-4eb0-41e1-acda-5e28a3d38273/bass_fitness_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0afbdc04-0d7b-48a6-b2a0-9110b335fa51/history_of_the_periodic_table_quiz_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74afaa68-f565-4438-b803-67e9ad6727f9/13143720504.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a998a999-53c1-4c53-a0b3-cb4f77497bad/quantitative_analysis_for_management_12th_edition_solutions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af77160-359c-4080-8625-6b1d64b35cc3/2293061128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5602770-137a-4b4c-bc7e-047ba1459c7b/11422782978.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4b71946-ec76-4d06-8623-2754cf143c93/dekevifemafevurevoluxen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4458/7688/files/mafefuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8392/6171/files/banana_pancakes_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8011/4859/files/livizagobidokake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9651/4461/files/lotoziwuniladaratu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/charlie_and_the_chocolate_factory_book_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/high_school_biology_book_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/julesadixetagobisav.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/jekanibaji.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/69462782943.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/livro_numerologia_cabalistica.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_off000076ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76EA 5492 bytes
SHA-256: f28518523f45359a0010e20069498103cbec0e70d1dafb7e944beb89b0548b9d
font_01_sfnt_off000089b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B4 10368 bytes
SHA-256: 10c107bb4238a512c03ad568b49911daea72127eea17dd24205b9fbede47860c