Malicious PDF — malware analysis report

Static analysis result for SHA-256 a911f5f0b2e82a3a…

MALICIOUS

PDF

38.6 KB Created: 2020-09-30 00:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 028e791f2a5315e8f024a0e33df0fcc8 SHA-1: 5c351d6a5cf56be4e99a572d27999cccbb981701 SHA-256: a911f5f0b2e82a3a48e800e2e2463b186a41af99ba7ccea28391548455243a91
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=wordly+wise+3000+book+10+lesson+8+answer+key+pdf In PDF document text
    • http://tajagu.drcolinadunbar.com/uploads/1/3/1/0/131071252/mumomuvot-buwuf.pdfIn PDF document text
    • http://files.naturecoastdecorativeartists.com/uploads/1/3/1/0/131070611/pemigilitisalek.pdfIn PDF document text
    • http://nobanim.mokan.afaparents.org/uploads/1/3/0/9/130969707/rutozal.pdfIn PDF document text
    • https://site-1037098.mozfiles.com/files/1037098/nofuzibozorosit.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/1/0433/9898/7941/files/idaho_511_road_reports.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4270/8378/files/72005099340.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e67512-0e89-4d30-8644-fc34f743c8d7/pinubifitajeraxekotulolix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64c5223-fc12-43e3-b6c0-e709a9ed9d56/62006122471.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53b5b2dc-81cc-4a56-b543-07c9d7b20774/nanavazejazapudevalurato.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_off000056fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x56FD 5996 bytes
SHA-256: 9421a2266cd6eed983d91bc67c02f64365cddd0f40dda90fce0fbb5fd3562476
font_01_sfnt_off00006b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B93 10028 bytes
SHA-256: c86973f1f5b07da9db1117be320e696375de12178cdc6aadff00744a5608447e