Malicious PDF — malware analysis report

Static analysis result for SHA-256 4983c31b1d8414ea…

MALICIOUS

PDF

39.0 KB Created: 2020-10-06 17:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: db582184ea75bbc75dd3fc37a73853bd SHA-1: ba3b37e108cddaabf7e299b5f997232659ffb4d9 SHA-256: 4983c31b1d8414eaa36f292ba6d331f8d0da4885d51aaffd8fc7320b084ac73f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically identified as a redirector to malicious infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of outbound links, suggesting a link farm designed to distribute malicious content or engage in SEO abuse. The ML classifier strongly supports the malicious nature of this PDF. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=feria+matematica+preescolar In PDF document text
    • https://site-1036981.mozfiles.com/files/1036981/45991237605.pdfIn PDF document text
    • https://site-1036850.mozfiles.com/files/1036850/tataxadeg.pdfIn PDF document text
    • https://site-1042604.mozfiles.com/files/1042604/sunute.pdfIn PDF document text
    • https://site-1039783.mozfiles.com/files/1039783/76146943839.pdfIn PDF document text
    • https://site-1039538.mozfiles.com/files/1039538/tasomiji.pdfIn PDF document text
    • http://kemutisu.italianschoolofcycling.com/uploads/1/3/1/1/131163857/3221976c8383204.pdfIn PDF document text
    • http://files.d-fligt.com/uploads/1/3/1/4/131483550/ef95b32e1.pdfIn PDF document text
    • http://files.dmcipropertyinvestment.com/uploads/1/3/1/3/131379211/kunoxepu_zutugatosoxe_baxalosug_jigafo.pdfIn PDF document text
    • http://files.weddingtonpto.com/uploads/1/3/1/8/131857038/fisomina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0488/9760/files/teacher_web_com.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9127/2895/files/8215601050.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/3826/2684/files/digital_system_design_using_vhdl_charles_h_roth.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7428/0855/files/prepare_adjusting_journal_entries_for_the_year_ended.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d25a1ec9-aa12-41c5-9fe1-b78d18620b26/45408741123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e35c565-e9ae-4fc6-8ff7-4652459ed95c/12560250115.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/096ce92b-b526-441a-b808-62fd5ddd2d60/safoxoloj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/573b5d0f-ce29-4bae-97ff-a3420f06c333/52983141315.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/467ee7ff-98ad-4693-b776-6e514abfe76a/64900724723.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4EE5 4716 bytes
SHA-256: 912ced8b918d7e1e7761fbbf72dcb26b7bd7b654cee4a4ed8a5b7d0ed9aa027b
font_01_sfnt_off00005edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EDD 9920 bytes
SHA-256: f18ac45cc658965d2ffef648719db9562de300254b9523b44e2780f34e352d67
font_02_sfnt_off000080c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80C9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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