Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3d2a3ec7f59308…

MALICIOUS

PDF

39.4 KB Created: 2020-10-03 23:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: b0a790e95331b8dbd3fec3744c612b2b SHA-1: 2a0692bc8172f13c1476edf62bdca2660e51420e SHA-256: 9b3d2a3ec7f59308d3638eb92fb5e747b6d2b1756bfae90378f8a9f35b7fa28c
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=xforce+keygen+for+autocad+2016+32+bit In PDF document text
    • https://site-1039631.mozfiles.com/files/1039631/50502176919.pdfIn PDF document text
    • https://site-1040358.mozfiles.com/files/1040358/40871480112.pdfIn PDF document text
    • https://site-1039545.mozfiles.com/files/1039545/bexazuk.pdfIn PDF document text
    • http://sijikut.gandrrocks.com/uploads/1/3/2/3/132302780/ketodanexevupef-bifarib-dolubes.pdfIn PDF document text
    • http://files.johnscothist.com/uploads/1/3/1/4/131438056/nezepasexono.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/1/0429/1703/6198/files/communication_accommodation_theory_in_movies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3277/8651/files/photoshop_cc_classroom_in_a_book_2018.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9719/2603/files/firuzagokugixavigagi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9883/5611/files/richard_w._evans_jr.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3085/7886/files/57665351989.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7752/3861/files/2130020717.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_off000057ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57EA 5908 bytes
SHA-256: 0ef48f8813a18d78e84fd6f4c8c48e5d11b8ddff9e186a5c7187add7a112c4a4
font_01_sfnt_off00006c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C1F 10872 bytes
SHA-256: 084347147dc99d0a13f0e32dac6e2898cbc0749f165f4a461897d8fef070aec7