Malicious PDF — malware analysis report

Static analysis result for SHA-256 90d4a377beb02e74…

MALICIOUS

PDF

35.8 KB Created: 2020-10-06 22:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 30048d4bb54831bd5d8fcbb5da0d2358 SHA-1: 7fac7c14e0a91f8544cfcad719661606e2797fa4 SHA-256: 90d4a377beb02e7422c3e8964b180b295ef454a081cb782536fe27ccd3d8c10a
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirect to known malicious infrastructure. The primary redirector URL is https://cctraff.ru/strik?keyword=spanish+ser+vs+estar+worksheet, which is associated with malicious activity. This indicates a link farm designed to distribute malicious content or phish users.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=spanish+ser+vs+estar+worksheet In PDF document text
    • https://site-1037157.mozfiles.com/files/1037157/61849233619.pdfIn PDF document text
    • https://site-1039494.mozfiles.com/files/1039494/46450434850.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/6675297461.pdfIn PDF document text
    • https://site-1041081.mozfiles.com/files/1041081/92563050516.pdfIn PDF document text
    • https://site-1037262.mozfiles.com/files/1037262/nilubixezilalobusin.pdfIn PDF document text
    • http://files.bostonsocialistunity.org/uploads/1/3/0/7/130775878/8014028.pdfIn PDF document text
    • http://files.bryanmierauphotography.com/uploads/1/3/0/7/130775529/3600162.pdfIn PDF document text
    • http://gezakatu.dealswithamy.com/uploads/1/3/1/4/131482975/gawumelesaxezak_furirezu.pdfIn PDF document text
    • http://dofiz.colmed.info/uploads/1/3/0/9/130969916/juwapizol_zefazixuwusemu.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/c430b44f-54d1-4cf2-b96a-536516033c03/pololupowogegujet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/490ca4d0-1ac1-4691-9b2e-2ef3fc0bbd80/4062070181.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1428476-2535-41ef-a8c7-d549b737379d/kafus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2d043b4-855f-4ee6-aa8c-5cc3f5f97384/18937141845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eba5bff9-7315-4aa1-b881-cffb2647f046/pejivapadepuvotis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab6df072-a233-491e-bea8-938fd005aebd/77666692891.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_off00004e5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5E 5196 bytes
SHA-256: 6187018d10e2da36c1d41d67661df6a8c0449b252921cfe05b208b2ce8695f5b
font_01_sfnt_off00006012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6012 9892 bytes
SHA-256: 9426c32217662dc85d38aba988fb7f39a1b6775e384627fd7826e27cc1ff3336

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