Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2a4535e11c255a…

MALICIOUS

PDF

39.4 KB Created: 2020-10-02 20:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 4ccc7678e8c14b584abe243abdd24f51 SHA-1: 5400349c9e05da0d8f44949674c28140d6e99e41 SHA-256: dc2a4535e11c255a86a2bfb82db7791381ec4bcba513e409e87c7b28be5f6cea
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://ttraff.link/pify?keyword=doing+data+science+o%2527reilly+pdf In PDF document text
    • http://files.bellafurworks.com/uploads/1/3/1/8/131856381/duguvat.pdfIn PDF document text
    • http://telita.celebratekidslv.com/uploads/1/3/0/7/130738721/munitebozu.pdfIn PDF document text
    • http://files.newjerseyparaunityexpo.com/uploads/1/3/2/7/132740533/3800625.pdfIn PDF document text
    • https://site-1036637.mozfiles.com/files/1036637/87208263029.pdfIn PDF document text
    • https://site-1037230.mozfiles.com/files/1037230/wujakalaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/18710654090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/vuzaxipax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5919/9650/files/23612726139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07531508-2714-4187-80c5-e1addc4bb077/vinejoragurasuzujasodidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304b8298-f6e6-43b7-b5aa-589ee11fa3cf/24444051853.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba4208f-a4ea-47e3-ab02-3e5598d24736/kovovewerefepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba59ab27-af2f-4e0a-873c-26e5c1992fee/nimodojexasoxebupozekulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47afecdb-b185-409a-b92a-438616bed24e/63096382360.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_off00005b1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B1C 5456 bytes
SHA-256: c9a68f5cdd038c47e9f9eab174ef6a60822cd6147849dc93cdcf9fbeed79b2de
font_01_sfnt_off00006dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD5 10288 bytes
SHA-256: 4165871f704975ff73327a2b4adad4588d91f3f1cb04aa3e324d96000935cac5

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