Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a0c93c7804fad9…

MALICIOUS

PDF

36.9 KB Created: 2020-10-03 09:53:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 0ad4fe926a359497a85c3765cc33c604 SHA-1: e2d39f8e05bbac682662a98c533b658800017149 SHA-256: 04a0c93c7804fad979c629b559babb16752904297d089da7d82dd35d288d6fab
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://cctraff.ru/strik?keyword=quavo+huncho+album+zip In PDF document text
    • https://site-1036745.mozfiles.com/files/1036745/39557289642.pdfIn PDF document text
    • https://site-1036779.mozfiles.com/files/1036779/tadidekizuwudenuxid.pdfIn PDF document text
    • https://site-1037055.mozfiles.com/files/1037055/50252211512.pdfIn PDF document text
    • http://rusaxigaw.cartradio.com/uploads/1/3/1/4/131437889/a4ab28b.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/adbccf6f-78f4-4d7c-b28c-66de1d063127/72042458777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eafab80a-65fc-426f-8d54-76a10cc9a93d/61696502319.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae08dbd-b950-4703-9adf-ee4373aa9168/45234815949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/0644/1125/files/did_i_miss_anything_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2407/4912/files/25061885793.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4686/5576/files/67869477161.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1560/9761/files/cal_poly_pomona_office_of_admissions_and_outreach.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/zhuangzi_italiano.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_off00004adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADB 5208 bytes
SHA-256: b122773839c51d9eb9ee4c8a933f9e52922195bfc4421cb2c3df6d3f87fe1284
font_01_sfnt_off00005c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C7C 13692 bytes
SHA-256: a09445a41ef9a70132490247973147466ce5c9731547f48100a323b957d2e64b