Malicious PDF — malware analysis report

Static analysis result for SHA-256 66fe90de9c34add1…

MALICIOUS

PDF

41.1 KB Created: 2020-10-17 09:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5544d2c1659e5a4be81c1525f5be412f SHA-1: fdedaf81f7c91c32067f98bdccfa71a992b80fb1 SHA-256: 66fe90de9c34add1663fc77999a78162e00a1475b80cb4bf5bf341552f4285b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, many of which point to external PDF files hosted on platforms like Strikingly and Shopify, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to a known malicious redirector, https://cctraff.ru/strik?keyword=judy+moody+and+the+bucket+list, which is likely intended to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=judy+moody+and+the+bucket+list In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f88ce8fa2b1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f87157c120fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365586/normal_5f87085b1619b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365582/normal_5f87204e36362.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368238/normal_5f88ebced8a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f89fcd62a300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5f8a0dd5a1268.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/8056441.pdfIn PDF document text
    • https://rokolumer.weebly.com/uploads/1/3/0/9/130969153/a47c14fb2.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/b63e5cc2521.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/votuzulogi_kuwevuzazifudo_gekajapover.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/edb98739-1f05-4dfb-923b-c52d080badfb/tosasubalova.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b644c3-7635-493e-896b-c9973a924ac8/54666694292.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/853078e2-9db7-4045-b8c7-95e444c0306e/54471564762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39fcbd3e-0635-4749-b702-2798b6edd57a/24666791210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4aa12c6-26cb-4fbc-9842-57f3a493117e/44595019907.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8073/5648/files/slip_and_slide_kickball_supplies.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9327/0429/files/kibebuki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4048/0666/files/27123716395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/6108/4828/files/jekoxemuduwe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/9424/4008/files/laudato_si_quote.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4418/3974/files/robijelusetoduvif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5600/8868/files/hack_game_apk_download.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_off000062a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 5380 bytes
SHA-256: e83f368480e0adca935329813884ff739ee3bcc84dff62f4af0dbdbb2c41f979
font_01_sfnt_off000074c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74C7 9976 bytes
SHA-256: c0b65a1261f83634d753468b42d34c38894735e44b5014b27c2dbd8bb6af74c9

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