Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3369691fb93c63…

MALICIOUS

PDF

43.0 KB Created: 2020-10-03 07:11:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 603b4536d340c18fd188ab349e14e412 SHA-1: ae566cb060943bfd3cde4c56beb09c0810e50595 SHA-256: 4a3369691fb93c6391bf47f1a5a168e5e1367ebe7cb4b96aca5b350f087509d6
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://ggtraff.ru/strik?keyword=advantages+and+disadvantages+of+profit+maximization+pdf In PDF document text
    • http://files.royalecare-afc.com/uploads/1/3/0/7/130775337/36fcf1.pdfIn PDF document text
    • http://files.50plusstickingtogether.com/uploads/1/3/0/9/130969510/aa98a3221e.pdfIn PDF document text
    • http://files.harperjeffrey.com/uploads/1/3/0/7/130775772/rakusaju-pamosowakejono-kudivaselupi.pdfIn PDF document text
    • https://site-1038919.mozfiles.com/files/1038919/32997136203.pdfIn PDF document text
    • https://site-1039669.mozfiles.com/files/1039669/wedofiwafe.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
    • https://uploads.strikinglycdn.com/files/5f23cec3-7970-48b7-9340-fd91963c0142/kekakinilukodabowujujos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bba824-5bf4-49c1-9b8e-05add79c47d9/kudupokaradojoki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66112e8f-2a0d-415d-85aa-47f13c2117fe/vofopevikadere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c80dec27-101c-4bd5-a573-c5cfe4d0ae30/xabejotoran.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da788bb2-4f76-4a1e-a09c-d742dc11990e/72103054126.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c90202-121c-4379-87f7-ef3346d001cb/79891888972.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5daa9940-c8b8-4da6-b0dd-122ad43e342d/41768783222.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 5284 bytes
SHA-256: d30471d5077835b062b13b33b9f47e728971734026e38deb8675ac4652a69139
font_01_sfnt_off000070ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70CE 9376 bytes
SHA-256: 44a0d572e95d05fb95d4d8bffd66ac2bd4bfef12debaea00cfaac2728cf62f4d
font_02_sfnt_off000090e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90E2 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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