Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5649a3a7e8dc5a9…

MALICIOUS

PDF

48.1 KB Created: 2020-10-15 06:27:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 49980a0bf8927b5dd77eb9919b417e96 SHA-1: e2513b3a141c81402b82ecf94f592f498709ea30 SHA-256: a5649a3a7e8dc5a9b5c9e9d255b4869e83960218180ab19167c3e0b9cb3a54e7
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one critical heuristic identifying it as a redirector to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector. The presence of numerous external PDF links suggests an attempt to create a link farm or distribute further malicious content.

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=neuropsychological+assessment+lezak+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8712c3e667f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5f8772a86b61c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f87bf1753fb3.pdfIn PDF document text
    • https://site-1036646.mozfiles.com/files/1036646/xagalamomosuwosozaxaraki.pdfIn PDF document text
    • https://site-1040037.mozfiles.com/files/1040037/683624228.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/86209555531.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/76999386019.pdfIn PDF document text
    • https://kasukironumasex.weebly.com/uploads/1/3/1/4/131454791/2185233.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/domovodibaposix.pdfIn PDF document text
    • https://mojenosude.weebly.com/uploads/1/3/1/3/131382274/bamunekavif-zozisikalafo-lugawo-wurifupit.pdfIn PDF document text
    • https://xisubuto.weebly.com/uploads/1/3/1/3/131380177/575a83f9255b00.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/1/0437/5465/1799/files/fighting_on_two_fronts_nazjatar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7701/6483/files/86619050012.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/30631299484.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/6239/4517/files/letijuwusi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8321/6549/files/multiple_google_chrome_processes_on_task_manager._why.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0328/0027/files/pudiloresub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0944/9884/files/1976_dodge_motorhome_manual.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_off00007bdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDC 5756 bytes
SHA-256: 457353bd5735403bc731a93a5483a136d86c335de946bf8f3149e7ddbe1a05d3
font_01_sfnt_off00008f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F6B 10544 bytes
SHA-256: fad867b623ad8262c21ee6ce4ebe7201f34ce422845fd358cf35fa80abe32754

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