Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51b873dc350ceb0…

MALICIOUS

PDF

42.5 KB Created: 2020-10-11 23:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d704a76e7b3a3a5c963469c29036e974 SHA-1: fece76bd720a4aacf72e497daf5fd3c39f2dd771 SHA-256: c51b873dc350ceb05998172fb0e1827a97a94e76c2388d683b2eff007fab7575
124 Risk Score

Malware Insights

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

This PDF document contains multiple embedded URLs, with a primary link to `https://cctraff.ru/strik?keyword=dictionnaire+fran%25C3%25A7ais+h%25C3%25A9breu+phon%25C3%25A9ti`, identified as a malicious redirector. The document's structure and the presence of numerous links suggest it is designed to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the PDF's nature and the malicious URL strongly indicate a phishing or redirection attack.

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 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=dictionnaire+fran%25C3%25A7ais+h%25C3%25A9breu+phon%25C3%25A9ti In PDF document text
    • http://wosubokur.chelseawardart.com/uploads/1/3/0/7/130739393/957894.pdfIn PDF document text
    • https://site-1038803.mozfiles.com/files/1038803/bozozuraxepajebusejir.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/safulonutulegerugupimat.pdfIn PDF document text
    • https://site-1040145.mozfiles.com/files/1040145/41651087907.pdfIn PDF document text
    • https://site-1040358.mozfiles.com/files/1040358/rufipi.pdfIn PDF document text
    • https://site-1036665.mozfiles.com/files/1036665/52423887921.pdfIn PDF document text
    • https://site-1043491.mozfiles.com/files/1043491/diluribidodepizifor.pdfIn PDF document text
    • https://site-1048221.mozfiles.com/files/1048221/zejejulikijagubo.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/1/0497/2203/2285/files/cute_flash_drives_names.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9648/2996/files/52150387244.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9249/9868/files/dubotorejujit.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_off00005dee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DEE 5536 bytes
SHA-256: 895be090ce8b63b5230a4a3e374604258e94dad8d3d30568a7edf88d39293ad7
font_01_sfnt_off0000702e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x702E 13432 bytes
SHA-256: 2e29abbbfd04b643c1ab2ca9a3b45ccd15e3d31f6f9e09fd9f623fc5dfad7fea

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