Malicious PDF — malware analysis report

Static analysis result for SHA-256 680f2ff87f69ee09…

MALICIOUS

PDF

41.1 KB Created: 2020-10-10 05:36:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: b04eb395cd20d015a128169c2f8f915b SHA-1: e63e3344d99be1818b01cc0f1a3be2bc54c722eb SHA-256: 680f2ff87f69ee09a310f784fdbd3601c8059ba6b4d5d98f99991cde4736979b
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=nsw+premier%2527s+spelling+bee+2017+word+list In PDF document text
    • https://site-1043055.mozfiles.com/files/1043055/53196611223.pdfIn PDF document text
    • https://site-1037091.mozfiles.com/files/1037091/74991509008.pdfIn PDF document text
    • http://files.coonrapidssnowflakedays.com/uploads/1/3/2/3/132303282/vozoxumobazalu.pdfIn PDF document text
    • http://files.vaneatonmusic.com/uploads/1/3/0/8/130873717/wubezitomofal.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/e605966e-e29b-49b5-9f00-93d26d5202c6/51810796465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee52f40d-4ae1-4c83-8959-761a1c0142b7/56018459303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdbf90cd-bbfd-4625-b159-e93afd5c821f/86409739125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9a4925-d140-45f9-836f-296f6f44ead5/41702080095.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e925a4db-4934-4e30-a6aa-fc6da02238cb/zuzijiwen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b10097-3440-442c-ad0c-4643bff1f8ec/35070978686.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_off00006136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6136 5712 bytes
SHA-256: 3943369620509b8148ed6920a7c2c5aa3ea37467a5394703aa2eb1f4673539b5
font_01_sfnt_off000074bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74BF 10276 bytes
SHA-256: 5b7308aa3ce06d70d689235f8872cc5ffa9e7124fdb5ba63fc0a6901d2922838

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