Malicious PDF — malware analysis report

Static analysis result for SHA-256 a875852f91ce042b…

MALICIOUS

PDF

71.4 KB Created: 2020-10-19 04:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: 28088b90fe7a0d68d47ec0f2f883ef41 SHA-1: 50c7641ce1bfb500993cce07d84f5435b16b46d2 SHA-256: a875852f91ce042b3467a4d8529ed2db7219b5717c1c5ff0b545f5a0f44293ad
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=fruta+verde+enrique+serna In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368996/normal_5f888a986ee1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369173/normal_5f88ad390b71c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f88630289ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369901/normal_5f8bd31912d27.pdfIn PDF document text
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/ruwopavudaze_nibiwiniv.pdfIn PDF document text
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/89b144215.pdfIn PDF document text
    • https://lokixesope.weebly.com/uploads/1/3/1/6/131607163/zuzokarasig.pdfIn PDF document text
    • https://jasazifo.weebly.com/uploads/1/3/1/4/131437377/fugevo-tufuwepu.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/1/0496/6980/0089/files/assemblies_of_god_16_fundamental_truths.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/6886/6214/files/34938521302.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/wivodavidipitituxawutaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8571/6901/files/luxasananajisosusudaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/3637/5705/files/kogoximujefivejekepu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9274/5634/files/rokefuvevafifinomepe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1509/4439/files/mia_married_at_first_sight_jared_evans.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9edde751-5b7f-4029-b3d3-77d3029484b6/97275112936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834a6ab5-030b-421f-baa1-5e96be62f4dc/19284281992.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7c7b0cf-4cf9-4acf-b0e3-0b2bba2bccd6/59804307086.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/4883/2671/files/high_hopes_panic_at_the_disco_facts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/74409241213.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 26228 bytes
SHA-256: 37e723e7edd6348861d17f5ff42311053412392b08ff82ea271e244bbbe179c2
font_01_sfnt_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 4928 bytes
SHA-256: d4563900717c9514097c5a2b94d1303598437b2501af9dca12222ee38f5fc78f
font_02_sfnt_off0000d2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A3 11612 bytes
SHA-256: 52b710bad4742a11cc911900993bc56c965cacd291df733e15a7299a067b7880
font_03_sfnt_off0000f893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF893 16292 bytes
SHA-256: 710baf30bca5f67cc50f1fade7b5bb07c63124cf4a57b19e71a926774a6b5d7d