Malicious PDF — malware analysis report

Static analysis result for SHA-256 80003ff1933a7dc8…

MALICIOUS

PDF

33.4 KB Created: 2020-10-03 07:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 60ea01c79c31e42dd4b2d1d11173ffb6 SHA-1: fdf958ee179b071e41420db4803224081dc0331e SHA-256: 80003ff1933a7dc84d7865c67bd86af7df0624d68b80ed193145bf03438e4c9e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that point to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL, suggesting an attempt to lure the user to a compromised site. The presence of numerous links to disposable hosting further supports a malicious intent, likely for SEO poisoning or traffic redirection.

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 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://ggtraff.ru/strik?keyword=kuby+immunology+6th+edition In PDF document text
    • https://site-1040975.mozfiles.com/files/1040975/kaked.pdfIn PDF document text
    • https://site-1039689.mozfiles.com/files/1039689/zimozupid.pdfIn PDF document text
    • https://site-1037224.mozfiles.com/files/1037224/79048110820.pdfIn PDF document text
    • http://files.meiageddes.com/uploads/1/3/0/7/130776407/xubopopimidafaxefeza.pdfIn PDF document text
    • http://files.karenlittlewood.ca/uploads/1/3/2/6/132681188/xixuja_diwonixuruluve.pdfIn PDF document text
    • http://files.heralindsaybird.com/uploads/1/3/0/9/130969818/6162516.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/1/0467/7648/3993/files/oregon_wi_school_district_calendar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7167/6314/files/clark_county_active_warrant_search.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8367/7339/files/rain_train_sprinkler_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9999/4778/files/meratudebigapixatemelixef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7689dfb-6a67-4233-8760-05732143ba12/mipizuwudil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f7e271-8dd2-4cc6-8cd7-905e3e1b21e7/deleredinakowodibubix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eebf5f5d-e10e-4aa3-a316-7ef568651a9e/8214089366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6525da8b-a439-4383-9111-91f2343862b9/zozirufikusabikef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e95875-45e8-49f2-81e8-d30bcbd5d466/lirekesugafalirupawobu.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_off000046fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46FE 5120 bytes
SHA-256: cec5bfa4d1cd55b0563feadd34197e5eb5f8400e085f88bbdedc5d4b11bd6c67
font_01_sfnt_off00005853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5853 9492 bytes
SHA-256: 1c81f63602435038c4fad7b6df21ddfaee0712ed859c78fc251ea48f1cd77871

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