Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e99a1fd06f2104…

MALICIOUS

PDF

44.3 KB Created: 2020-09-30 16:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: ced111a775086ff7f881c4ac3e450696 SHA-1: ed2d06b9db1e5a5543c88b950a2c5800e3b2b613 SHA-256: 54e99a1fd06f2104cad12c94f70a1ecd06464ee6bedad0f69ca6b4ac41f6769a
184 Risk Score

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://cctraff.ru/strik?keyword=functional+analysis+exercises+with+solutions+pdf In PDF document text
    • https://site-1037218.mozfiles.com/files/1037218/lalififizivegutase.pdfIn PDF document text
    • https://site-1036823.mozfiles.com/files/1036823/75543852786.pdfIn PDF document text
    • https://site-1036785.mozfiles.com/files/1036785/vunirusevasoteda.pdfIn PDF document text
    • https://site-1037865.mozfiles.com/files/1037865/19135049389.pdfIn PDF document text
    • https://site-1036734.mozfiles.com/files/1036734/fefijutobutonem.pdfIn PDF document text
    • https://site-1038707.mozfiles.com/files/1038707/zozapiraz.pdfIn PDF document text
    • http://vinovuna.thejoyfueledteacher.com/uploads/1/3/0/7/130776585/9ebe335763a.pdfIn PDF document text
    • http://nozew.hopespayneuter.org/uploads/1/3/0/8/130814328/vemidepijokur_sexunirevete_zixogewif_gurisurejogidod.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/1/0434/3798/1852/files/cutting_edge_upper_intermediate_third_edition_workbook_answer_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6133/7494/files/el_jorobado_de_notre_dame_pelicula_c.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7938/4736/files/51935310653.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_off00006fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC4 5460 bytes
SHA-256: 4a5af5d0fac69790aa058da125da6a93380165dcb65afe0854b6cff4038711c6
font_01_sfnt_off00008274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8274 9836 bytes
SHA-256: 27b1b791da9892dc27a0c760d03851691042bec9df3fa98b4dbb9c367dec24cf