Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a11a6d9c04b856…

MALICIOUS

PDF

45.1 KB Created: 2020-10-03 05:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d37390358f5456d0471aca41a6082c15 SHA-1: af0213993cdf45c2e9b3e9aa4b418e4e02967c60 SHA-256: a7a11a6d9c04b8561cf42eec0292bc231ae11a176fc06f0b0f558771ef91f649
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=dls+19+all+logos+v1+zip In PDF document text
    • http://wazura.abbyvasek.com/uploads/1/3/2/7/132712207/logotigifu-nakolibozu.pdfIn PDF document text
    • http://files.onemorestop.me/uploads/1/3/0/7/130775520/xobujuni_jiruvita_nelorifapu.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/lufapij.pdfIn PDF document text
    • https://site-1036872.mozfiles.com/files/1036872/20901372383.pdfIn PDF document text
    • https://site-1037071.mozfiles.com/files/1037071/najenemajis.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/1/0484/2962/9594/files/50874824607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2700/4577/files/reflection_and_refraction_worksheet_middle_school.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2468/1640/files/redipidalemenilogude.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f6672e1-5c22-4d2e-91d3-12e79754bc55/43259070221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8419b606-010f-44a9-9f7c-a7f3550f17ba/jinowutazarukadubiraze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d1cb5f-adfe-4e0a-a2f2-3471f7fc8dc9/jogugikupal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb034a31-9495-4063-8968-f2b5e183fed1/pamadeguwaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd2b71be-e38f-445b-bd17-8ce487ca98fe/47041393521.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_off0000731a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x731A 5208 bytes
SHA-256: e95a00f8f53e940d586b4964b5e6ee6d4382860dab955f63cfaefe546acdd82c
font_01_sfnt_off00008507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8507 10248 bytes
SHA-256: 7e60447d8895251630ff121c0386095ee1c484256b2c7274349e5574f5fea919

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