Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ea96ddb487e41d…

MALICIOUS

PDF

46.8 KB Created: 2020-10-01 23:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: d746c50479b62119feb57d62dfc995ab SHA-1: ac6c36843268ad6bd9a9a35c194da82585daf8af SHA-256: a2ea96ddb487e41dc04396f54ac78396fda599d1fe9af987e56c9db1b4d8c3b5
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=navidad+mafalda+mensajes+de+derecho In PDF document text
    • https://site-1037054.mozfiles.com/files/1037054/50928793863.pdfIn PDF document text
    • https://site-1037035.mozfiles.com/files/1037035/96337534593.pdfIn PDF document text
    • https://site-1038844.mozfiles.com/files/1038844/dizudixuxanagaxepinojup.pdfIn PDF document text
    • https://site-1036876.mozfiles.com/files/1036876/folixirepemu.pdfIn PDF document text
    • https://site-1038526.mozfiles.com/files/1038526/xemamoxetaxoxatuwimu.pdfIn PDF document text
    • http://files.getfitsd.org/uploads/1/3/0/9/130969714/8843807.pdfIn PDF document text
    • http://mitibu.gordonoyer.com/uploads/1/3/1/3/131382243/xafudomujadej.pdfIn PDF document text
    • http://files.dorothysgrange.com/uploads/1/3/0/8/130814355/kivetonak-zapomovemoriwil.pdfIn PDF document text
    • http://files.theartsparkle.com/uploads/1/3/0/7/130775257/xepimavexefile.pdfIn PDF document text
    • http://files.morefitstudio.com/uploads/1/3/0/7/130775750/5887471.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/1/0432/8869/0841/files/xubero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5104/2984/files/nagipuwodifujazoxotifug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/sagesop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5376/0162/files/philips_respironics_system_one_owners_manual.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_off00007528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 5364 bytes
SHA-256: 8aa5a0fc741f13771542718975263aa3e9a6cd2fbb6894c12a53fb75eb524ad3
font_01_sfnt_off00008750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8750 11324 bytes
SHA-256: 44f75ddae5bff488f3cb82980c2132da0599a237ae07d869d5fd732fc3ff5291