Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0447515b11a801…

MALICIOUS

PDF

47.1 KB Created: 2020-10-10 10:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 43b50d643c4325f43f563d04953adae5 SHA-1: b1ca41ee84f6784a7db97847d4367a9a0fc87b3a SHA-256: 4b0447515b11a8019dd148eec437e221d85e4fe91df459ebb67dd374268e31f0
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://cctraff.ru/strik?keyword=castle+serenity+pellet+stove+manual In PDF document text
    • http://suxem.facchollywood.org/uploads/1/3/1/6/131606490/gimenawoxupit_guwube_tajedol.pdfIn PDF document text
    • http://files.shadeforplants.com/uploads/1/3/2/7/132710783/1338795.pdfIn PDF document text
    • http://files.coonrapidssnowflakedays.com/uploads/1/3/0/7/130776728/cddaa50.pdfIn PDF document text
    • http://files.afterhoursbandus.com/uploads/1/3/0/8/130874567/6b880435242ce.pdfIn PDF document text
    • http://files.rafaelfraga.com/uploads/1/3/2/6/132683137/radazunorolamaf.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/7d16d90a-12e0-463f-8a3c-3d836f286b57/vomatinakokexilafolisisu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/2544/8091/files/fuxotipaneluzanikedoxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6511/7334/files/27385857337.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2723/7533/files/harlem_link_charter_school_staff.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4173/7882/files/61593073504.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2906/5639/files/80214883083.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/450e33dc-938e-484d-8c17-4937b5facdb1/2963186109.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0defe15e-3c84-4e33-9fc2-82e4da2047aa/24224155496.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c530d0d6-2332-46a6-bd48-38acd27c7f5e/34267342474.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60df6ec5-f34b-4da2-8467-53d86bf459f0/fubabamuganupijexuxepeji.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_off00007b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1E 5032 bytes
SHA-256: 73b17ce9749883e56fe7b47e1a8e58d183f734f67adbed9d8d8ceadd2be46ee4
font_01_sfnt_off00008c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C30 10352 bytes
SHA-256: a8141bf7913428581676c8d75ea10d0f5d48ac1d07ce829f92a600cf32a4ef86

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