Malicious PDF — malware analysis report

Static analysis result for SHA-256 81133814283b04ef…

MALICIOUS

PDF

55.8 KB Created: 2020-10-04 01:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 93dcf8e801bf9a776cdfe5521e2ae8ec SHA-1: ed1970b0ec7536c4ab5541f970e450880cf0a8c9 SHA-256: 81133814283b04ef2454f56e0183288ef7ffbd4a967d578875b5bb02e313b603
124 Risk Score

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=ck2+best+culture In PDF document text
    • https://site-1039645.mozfiles.com/files/1039645/finezipizurixuramanevotug.pdfIn PDF document text
    • https://site-1036993.mozfiles.com/files/1036993/guwek.pdfIn PDF document text
    • https://site-1039768.mozfiles.com/files/1039768/76608924205.pdfIn PDF document text
    • https://site-1036725.mozfiles.com/files/1036725/32151344559.pdfIn PDF document text
    • https://site-1037115.mozfiles.com/files/1037115/59259367649.pdfIn PDF document text
    • http://files.ovhealthcenter.org/uploads/1/3/1/0/131069934/wudujo.pdfIn PDF document text
    • http://gefokorab.followingthelights.com/uploads/1/3/0/9/130968931/labojewibexajad.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/1/0429/9679/3503/files/bibawalosalofube.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0019/3182/files/jackson_elementary_school_elkhorn_wi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0601/1809/files/funudiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/9763/2157/files/vavewoxujerowu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6dad9e-b036-4142-99d2-d73b5c5df749/13168538952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1916592-9330-4e11-83f1-b80e76a085a7/94781128490.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_off0000a032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA032 4824 bytes
SHA-256: 10e4f20c411259468ca1bbaca79cf158bee4c62f3605190b1d1c55c0b807a593
font_01_sfnt_off0000b0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AF 9916 bytes
SHA-256: b09f92bd9556b6daf936e3ecbd6f4500ba11e9e3f0cb06ff318adc352e4ad1dc

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