Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5ddd99304e274b…

MALICIOUS

PDF

40.7 KB Created: 2020-09-30 21:35:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 40cbf7d46c397c693910402a6849023f SHA-1: 3badf88a5de9f6eb3b240da85f4ada980bc1f676 SHA-256: 8b5ddd99304e274bd0a7b91d4f3d6623baed864b5d0d9f6a6ecd6fba190e4b5e
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=apprendre+l%2527+italien+cours+pdf In PDF document text
    • http://files.riverwalkquilters.com/uploads/1/3/1/8/131856209/b80876e6.pdfIn PDF document text
    • http://files.pinkzebracheer.com/uploads/1/3/2/8/132815054/8286201.pdfIn PDF document text
    • http://xikomeba.yogabydaniellesmith.com/uploads/1/3/0/7/130739723/pepudetuv-gewupifuwetoge-rixev-zusigudoro.pdfIn PDF document text
    • http://regabeba.daniellebaldassari.com/uploads/1/3/0/7/130739892/5642326.pdfIn PDF document text
    • http://jivitoraf.mydiabeteskit.com/uploads/1/3/1/4/131454143/sejupog.pdfIn PDF document text
    • http://files.sanctuaryandresistance.org/uploads/1/3/1/4/131437161/jodepureteni.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/412f0dad-b035-4ec6-aded-6f56fc634eaf/guweraxezijalisab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7856bb8e-2498-4fbd-9fdc-3c18f0be98ba/10608907822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44db7d36-422f-4920-a2d5-279825c9a82d/7883652108.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c51c2628-d35b-4161-a485-ddb3d53c8594/jemerenavazadenovorenis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8381a7e8-770d-4dcf-9b9a-d0f6018b800c/kazotokazubomigupikunepot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1119c40f-1b43-457f-b034-8467035f01d5/ralasarujopapalavu.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_off00005ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DDD 5172 bytes
SHA-256: e182e800737c63faffc6b754f1057a13eea1ce728cbe853245852f8769fff5f4
font_01_sfnt_off00006f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8B 11888 bytes
SHA-256: 2b40319faeafc80b3c7861b828ee11204df3791b7eb2cf41c7b1a59754af896b