Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32841f06877499e…

MALICIOUS

PDF

54.9 KB Created: 2020-10-01 23:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-01
MD5: c84769d729e114c8b56b6493d33ac6e6 SHA-1: 8754c4a7e35317c9251989458b0e0e56cb94e0d0 SHA-256: c32841f06877499eaf170af8f5b24061d3196b1ee1bb3e1b6c5a49a5d7af7d29
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with at least one pointing to a known malicious redirector. The heuristic firings indicate this is likely part of an SEO link farm or a phishing attempt disguised as a free download. The ML classifier strongly supports the malicious nature of this PDF.

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=teoria+de+la+imagen In PDF document text
    • http://files.lazonbyvillagehall.co.uk/uploads/1/3/0/7/130740553/tidegubugalidufum.pdfIn PDF document text
    • http://veroxa.ernst-arch.com/uploads/1/3/0/7/130776132/b881083659.pdfIn PDF document text
    • http://files.commonglamour.co/uploads/1/3/0/8/130813796/zedetabefulumozaw.pdfIn PDF document text
    • https://site-1036630.mozfiles.com/files/1036630/60177424917.pdfIn PDF document text
    • https://site-1037029.mozfiles.com/files/1037029/ruxino.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/265b7a9a-e080-48ee-b2fb-207f9ad741be/95759452526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65159302-4730-4217-9f3d-5b302425be53/41854539468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe7df3c-f43e-4c3c-a05d-e3a39b5782f5/52995053950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8719764b-4270-41b6-8a03-26e8448ba48b/36999990583.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa5f0f2f-b4d2-409a-9dd0-96fae7a486ae/titabi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4cc93f7-b8b9-4f66-a434-4c794dec15ef/39558405486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/048f9725-2c1d-4c0e-bd45-98df2abb72c7/35899873002.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_off00009b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B37 4916 bytes
SHA-256: df9d48c17849498d779acfe6dfbdae713e590b14e2b06b4b2fe96f6434e0b80a
font_01_sfnt_off0000abd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABD7 10284 bytes
SHA-256: 66e33d520bb80b0b5d518927aa935d00d754b8525ebed19e2dfd9145e31873ee

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