Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c2753269c19e6f…

MALICIOUS

PDF

42.1 KB Created: 2020-10-07 18:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 429ada40901bd0c3b5d360c98ee59d25 SHA-1: b118de1ed2288253d143e7d8273ddc2210006976 SHA-256: e4c2753269c19e6f95306fb62178b9bc9d3c4c3acde3e6373785b45f6cdcfb85
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=ielts+listening+test+2+accommodation+form+answers In PDF document text
    • http://vomutifan.neelsels.com/uploads/1/3/1/4/131408056/4541223.pdfIn PDF document text
    • http://jikoxalu.joachimkoops.com/uploads/1/3/1/8/131857284/tisixuvafoniwu_bolalifife.pdfIn PDF document text
    • http://gebimup.nubornpictures.com/uploads/1/3/0/9/130969259/37a8b53aad7.pdfIn PDF document text
    • http://files.nextpromotionalproductsandapparel.com/uploads/1/3/0/7/130776487/pekemuworipobu.pdfIn PDF document text
    • http://files.coastaldryhome.com/uploads/1/3/0/7/130739212/fedig_famita.pdfIn PDF document text
    • http://kujol.flyingunderdogs.com/uploads/1/3/0/8/130813786/lesufosif-tokobedo.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/1/0484/2864/6552/files/box_loca_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3509/3911/files/zenofunodizidodopugoxuki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3901/0201/files/firuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5520/0918/files/xevowip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8399/1714/files/mississippi_black_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bedf56e7-1a2b-44da-b0d4-7838335e7a38/nobilazivivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06778f66-4702-44c4-a875-1f7064259efa/39541128033.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_off000062cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CC 5500 bytes
SHA-256: 439848a86c6de9aeca5c05268cf9f1f1ef53ec89dd5b035f5cdfab2e48510280
font_01_sfnt_off00007582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7582 12684 bytes
SHA-256: caf8d45a11340cf27095d3f55c35cebedf621cdb60b9af70447551e10d1d0028