Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f1e84d8e5c6956…

MALICIOUS

PDF

54.3 KB Created: 2020-09-30 23:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 8f86efafb09a4c1d2159b1c15533991e SHA-1: 2110ae5cdd717735d9ea26aa195acd0f84bacfd4 SHA-256: b2f1e84d8e5c69567cb056f33cd965b247a103a2e32a3cea323e0a426adb39ee
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=high+carbon+steel+properties+pdf In PDF document text
    • http://lepeporo.urbanedenbeauty.co.uk/uploads/1/3/1/4/131413418/5711969.pdfIn PDF document text
    • http://katakad.therapyandlearningservices.com/uploads/1/3/0/7/130739509/renodubovenijivi.pdfIn PDF document text
    • http://files.jonesscience.com/uploads/1/3/1/6/131636916/linatebesodewibide.pdfIn PDF document text
    • http://nejakuwe.artbodysoulstudio.com/uploads/1/3/1/3/131378960/c642c46.pdfIn PDF document text
    • http://files.richelleputnam.net/uploads/1/3/1/6/131636625/248b3344.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/b7983dc9-2601-464a-a23f-d47d2b54489d/werewirolorulijasujefome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6302847-e62b-4486-8dd3-4074f6d60b60/41370610912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a1fbdb0-ac48-43d0-ba77-bc803ae4b2d6/minosimuzebofejaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e8c4063-db88-4da0-9d8b-37fbb3c8cbd2/ruxexutadule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5aa1d0e-6b9c-4754-b551-b05e977c30a3/88624912445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf7e4915-56b2-4dfa-957b-0f59c51f3086/zupijufolapikulaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21479898-e901-4943-8ce6-04a07f4c469d/32658574515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df5e8d72-25c4-4da2-aaf7-e83f22ef6bfc/86958738363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a49fcdf-0b7c-4a3c-ba2b-0b4909193c9b/10629384994.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b76b93-00d3-4abe-8dac-e29841dbdc40/zovofod.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_off0000967b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x967B 5516 bytes
SHA-256: ce5ac2a3e58e16f448b90469a0cb865084d8b612d198150e41098043ed6f4b39
font_01_sfnt_off0000a935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA935 10208 bytes
SHA-256: 643c5b0a796d7b403e7985f926f6539e3a14b99782bb4b4e6019f3f753699f74

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