Malicious PDF — malware analysis report

Static analysis result for SHA-256 c923d4ba44dfa638…

MALICIOUS

PDF

45.5 KB Created: 2020-10-02 15:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 286f26fd7e044745cf3b7f7ee32d3e66 SHA-1: 6d7664b6c0959f418aa490a3fe572bfa7f947d38 SHA-256: c923d4ba44dfa6384406fb6aa6dfefac46157caa66e6aece4e2a3eb5259d4fd5
194 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=skillz+rap+arriba+2018+descarga In PDF document text
    • https://site-1038344.mozfiles.com/files/1038344/totasofonaxew.pdfIn PDF document text
    • https://site-1036824.mozfiles.com/files/1036824/vuzudubomujinavavibunu.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/81447072017.pdfIn PDF document text
    • https://site-1039278.mozfiles.com/files/1039278/5617597416.pdfIn PDF document text
    • https://site-1037019.mozfiles.com/files/1037019/nukixumozib.pdfIn PDF document text
    • https://site-1039420.mozfiles.com/files/1039420/gevegasovopemuz.pdfIn PDF document text
    • http://gipev.shanebmckenna.com/uploads/1/3/2/7/132710784/3851876.pdfIn PDF document text
    • http://files.keenaneducationalconsulting.com/uploads/1/3/0/7/130775251/8931407.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/1/0495/5491/5488/files/title_vs_deed_of_trust.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0766/7099/files/el_valor_de_la_confiabilidad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1991/1335/files/nouns_that_start_with_en.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4687/8882/files/geography_of_china_worksheet_answers.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_off000069f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69F3 6116 bytes
SHA-256: d1828eea38d3aa141edc5998f86e3b7bebae5a2f1c67b6755ed69b2df42ac0dc
font_01_sfnt_off00007ed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7ED8 13288 bytes
SHA-256: 4fdc0725f32c4c9e3c6c0c280567509167ff3c43ad9720f76558d9aef563c3de