Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a37b0ff1b95c67b…

MALICIOUS

PDF

43.2 KB Created: 2020-10-11 13:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: b1c57e8d7670a072b29ebcfc5a45999f SHA-1: 46fb9cb2fa55c8c66c8defb2f1532d3cb91d72c6 SHA-256: 8a37b0ff1b95c67b22527f7ee767f3fb9730bac18209c8e778feacfec39e6ce3
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=lipidos+grasas+y+ascites+definicion In PDF document text
    • http://files.richieburridge.com/uploads/1/3/1/6/131606392/6448735.pdfIn PDF document text
    • http://mibep.eileenhutson.com/uploads/1/3/1/4/131437158/lokif-mimixubatumekev.pdfIn PDF document text
    • http://wumus.clarediane.com/uploads/1/3/0/7/130776525/905574.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/1e3b0978-4963-4103-86ab-e5c42e4f28a9/94309366683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332d855d-2b6b-40ec-acaa-f8888b736242/46383523729.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9987689e-5315-438a-a4b1-cf31e13fea93/kelatafejeta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f453ce4-e46b-4d56-a941-92e186f9f1d4/junikipi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45efc8a5-224a-43f1-a6b2-6c8bfe5c637d/wiwojojev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/3467/4853/files/texevinudurekarepodeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3651/7286/files/google_docs_frozen_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552983ae-507e-467f-9003-54138e9f9c8b/wafapulebedosidifufok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5138967-793d-47f4-a962-6bcb0081b0c3/nijuwexifuwaza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45959b5f-4395-46d3-a528-abad3ec2459f/97304180469.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_off000066bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66BD 5332 bytes
SHA-256: 1a69da09362c5d5d4e113e133d74835ff8fcfd45950889079e191c4782d4d6d3
font_01_sfnt_off000078fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78FE 11392 bytes
SHA-256: 4cafd8841b22f571d25f6bfe490e3d386ace3cc3982c00fd6cd34447b18be1a5

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