Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3e1c3b0ced8dd9…

MALICIOUS

PDF

44.5 KB Created: 2020-10-10 08:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: eeaddf5e0685139f7cdfabe8cd378788 SHA-1: e937264a6e003bce35ddebaed0bd2a4aaf3895d1 SHA-256: 6c3e1c3b0ced8dd90b36ef689ee45e3e1c85ab4125a78850db0b3afe022603ea
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=spanish+haiku+about+food In PDF document text
    • http://dozunajek.kira-marie-mccullough.com/uploads/1/3/1/4/131453558/kilabo.pdfIn PDF document text
    • http://fapabukot.benjaminyeo.com/uploads/1/3/1/4/131408027/37697f75a7b7.pdfIn PDF document text
    • http://files.divinelightandguidance.com/uploads/1/3/2/6/132682535/sikuwuwazejoturarub.pdfIn PDF document text
    • http://files.spectrafoto.com/uploads/1/3/0/7/130738797/4eac4f518f3.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/1/0484/3631/4280/files/better_homes_and_gardens_rectangular_umbrella.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1561/7691/files/bay_shore_high_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1816/5146/files/how_to_delete_a_table_in_google_docs_on_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3113/3351/files/79706006695.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/0196/4438/files/showbox_for_android_apk_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2060/5850/files/xesateloruvoverexuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7881/9735/files/fore_and_aft_cap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29cf3b9a-05f4-40d9-b1b1-7cb8d8d8fcbf/riwugovatix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2416b66f-f3f5-4277-b586-ea7dedf6c817/lejog.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_off00006cfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CFC 5308 bytes
SHA-256: 84202be0dfc67cc23945a7c36c5c9658045defab9b21f56b7bf9245b03759e20
font_01_sfnt_off00007f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F01 10952 bytes
SHA-256: c2cd7da5ea1d16652981bc2d180d53d970e81c7a3264c06405f2bbcf368124a9

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