Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb591dbc58f838e…

MALICIOUS

PDF

48.2 KB Created: 2020-10-14 22:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 634e4afb1857a559b292f602fa01780c SHA-1: 0f5e0138b7f3e8bca20e9cb67a8a02ba304147a3 SHA-256: 8bb591dbc58f838ef248508aa2fc29b820671132dcd16547f5fb2c3fed715a32
184 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.
  • 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=oxford+english+file+intermediate+workbook+pdf In PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/gonumuxilalap_kupepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_5f86fe930552b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f87095e489ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366360/normal_5f873e14a9055.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8726b286879.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365655/normal_5f874f282dce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f87003b1bb79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366017/normal_5f870cd3ca571.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3808383.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/papimi-nefewekapojerof-vorur.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/jolon_koxuzozudanik_makilitinami.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/83905a54a030772.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/93049f265a0000.pdfIn PDF document text
    • https://site-1040427.mozfiles.com/files/1040427/80052023475.pdfIn PDF document text
    • https://site-1041784.mozfiles.com/files/1041784/pelepur.pdfIn PDF document text
    • https://site-1048552.mozfiles.com/files/1048552/45852731305.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/1/0500/9250/7301/files/rottie_chow_mix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9129/6413/files/murder_mystery_2_roblox_knife_values.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0056/8221/files/2668281653.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2959/2214/files/baystate_reference_labs_agawam.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_off00007ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB7 5848 bytes
SHA-256: 41d1ff662a1b9de951df15205d3867736531cb29e1ecf5b1192e17703c914f21
font_01_sfnt_off00008e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E8B 10804 bytes
SHA-256: 87dc2d6c7be512036c41ea9779600c661ecec744f53b6ffa3379d0bd0e5af394

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