Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6fa5a3cb21f496…

MALICIOUS

PDF

35.7 KB Created: 2020-10-10 20:26:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 00bb9dcc60f93c94a0924f4971a01e26 SHA-1: a5c53c1f28a576185219e9545aebb55688f9bfe7 SHA-256: 4c6fa5a3cb21f496cb22b78ee1fc7d484d2c09904ffc0ff6d4bf572551720846
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://gettraff.ru/strik?keyword=hotpoint+washing+machine+motor+wiring+diagram In PDF document text
    • http://zododiz.bustransform.com/uploads/1/3/1/3/131379554/8772393.pdfIn PDF document text
    • http://files.laarmyexplorers.org/uploads/1/3/1/8/131857598/b04bab8d454f2e.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/1048dbf7-674e-4691-82cd-4a8c1bfb26fd/86785390530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e1a996f-31a4-45c8-a330-d009114aaa04/gomuxezovuxutuwinawujuwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ced8e0-ce14-49ed-976a-1376a676be8b/88163734597.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0935/1578/files/boston_heights_overlook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/lesuxejexadobakemalat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/3409/7317/files/gupefabozojedow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5102d0c8-c4d1-4efd-9353-2f9336d4d98a/13224868232.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c35069b-f080-4884-ad45-ea93d3d37520/ximuwewogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/713a062c-200b-4245-a519-1cbb02871733/85951480299.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de03dfc9-620d-4bbe-a449-a7cee86d809f/jokijesasemopavolawa.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_off00004e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E67 5508 bytes
SHA-256: cefb9d1385522dffd78b1648019de888c3ddc3746fe002147a1a50a435122b0d
font_01_sfnt_off000060f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60F3 9676 bytes
SHA-256: 2f3cbcf26765165b55a3da2b955dbed37ab0189e57451b61a035ecdfa17224a0

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