Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4d8140e0237eac…

MALICIOUS

PDF

63.1 KB Created: 2020-10-15 05:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: cc4acf085424e77179b67b34827f1084 SHA-1: e55c33c36a081963328edc4ab16d67f807a3afcd SHA-256: ca4d8140e0237eacb14f84c8365ea41b838c598f7c187d2d1f9d48a7b6f98c38
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=abhigyan+shakuntalam+book+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367959/normal_5f87703ab6766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_5f8777c7bad30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_5f86f514f4194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f8726c5813ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368503/normal_5f87b0a6a478f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5414/0054/files/23932893959.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/48816837879.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/61483527933.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/2140/0745/files/diffusion_and_osmosis_worksheet_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618c67f6-3599-4999-8830-14f37466fb0a/47274770499.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66928366-8813-41dc-8da5-e4df2a11ae73/wuboseresavifepuroxad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9fc674-b2b7-4e71-b77f-8c7e72780184/69873637661.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42ae883-1943-4906-b548-0c4559ff4d51/lunukoxerexufagetopimuvu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1627cfdc-5567-46e5-ab01-e15f8227b381/sifibejogilusudefominisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae81ddbd-6067-4acb-9822-424b56168e12/11192366102.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8976013e-c74d-4ece-95d4-49b38b47d2ce/13277446750.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C0 4088 bytes
SHA-256: 1f581625283ea961e88d22b90d7a317797b1d8ec43bb2f51718e86bd21e8abba
font_01_sfnt_off00009427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9427 5420 bytes
SHA-256: a7db58d6971d3ef323fe4a8cc8b9109fe18aa26dc1d1e1a9f98a4942dcea0b87
font_02_sfnt_off0000a66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA66A 10208 bytes
SHA-256: ad3c65db18839d5ea1c86f10f2593d9ced1067f6674f7fbcb95ec7d9391791f0
font_03_sfnt_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
font_04_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 6068 bytes
SHA-256: df99137803cdc608f240622d5ea106693886e3851ce3472f97a1d38a0e8c33a0

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