Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb53f5121c927a2…

MALICIOUS

PDF

44.8 KB Created: 2020-09-29 21:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d92e7bf6bb95bcae1a58def329fc243f SHA-1: de3dbfd0bbd38e2ac052be9dcf033d1082887a48 SHA-256: bcb53f5121c927a2ccf7ea90ac0cb62535ef2fec5e5f44b5f8639273306c5782
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://cctraff.ru/strik?keyword=anlage+e%25C3%25BCr+2018+formular+pdf+ausf%25C3%25BCllbar'. The document body, though heavily obfuscated, contains this same URL, suggesting it is the primary lure. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL within a document masquerading as a form indicates a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=anlage+e%25C3%25BCr+2018+formular+pdf+ausf%25C3%25BCllbar In PDF document text
    • https://site-1037160.mozfiles.com/files/1037160/55140991858.pdfIn PDF document text
    • https://site-1036902.mozfiles.com/files/1036902/nosikidogogap.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/kideg.pdfIn PDF document text
    • https://site-1037245.mozfiles.com/files/1037245/51769554654.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/fad2f94f-2558-4067-84ee-df0c49657277/52044064847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/715232a0-b6a3-41ab-8184-79af5a06028d/wopugovoxukulotaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825081d0-5d44-44cf-b33f-dcce263d6545/risulaxutozoradidinudole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65be0921-3862-417b-9bfb-9f6727dbff6d/xikugorusopiwuvoralonu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b428f6f-61d0-4650-aacf-86fdec0d7ad0/26530980216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07d5c2a-28db-4f31-83fa-cfff59c2b599/60204187340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9458de5d-13c7-4f18-9ca8-fffb31ab6e69/jaxigetalabu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acba668b-0030-44c6-b056-6d6938f378c3/xasefov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91026c4-7133-40dd-9e81-9bb6fd2eb1ed/dotinaki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99052cf4-c8d4-4fde-94ff-2f367bcc2b60/52063290307.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6bd1782-18c6-49d3-b0c6-612d748b7aad/vuvan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc8fe600-9972-4498-944a-b68e1d6c6709/79581465056.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_off00006b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B42 6128 bytes
SHA-256: ac90cae1095d4f499007ba4399a5b48900732d37b5c17c5391b4b67b58c82890
font_01_sfnt_off00007fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCB 10920 bytes
SHA-256: 523e3cad54d70114b6f4d7c3f17b74789d408aa22390380cda49123f7fb90c5e

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