Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cd5389ca42e027…

MALICIOUS

PDF

41.9 KB Created: 2020-10-25 07:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 343acc32fc6c4e48d523d06532bcd593 SHA-1: 92cfd0d2b6427abeab57ef324f1586a859e6b951 SHA-256: c4cd5389ca42e02783d68d57a72dd69e45ccceb423309308c687c5259482c5c1
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=utorrent+free++for+windows+10+softonic In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393345/normal_5f90c703e9f33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366371/normal_5f87a8fc72f40.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8740ee7bc47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369932/normal_5f93131b42915.pdfIn PDF document text
    • https://zozolexiwu.weebly.com/uploads/1/3/4/3/134343356/piwewal_vunali_kosiberovisudo_fidimo.pdfIn PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/837046.pdfIn PDF document text
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/radatowaramig_wuwaseguzu_fenasupid_vuxozeromotezek.pdfIn PDF document text
    • https://nunoperiv.weebly.com/uploads/1/3/1/8/131856708/kekejutokezatigu.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/2a6d61b135c.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/wapojumilitabe-ligunakewa-siruseduti.pdfIn PDF document text
    • https://nutolifawivu.weebly.com/uploads/1/3/1/4/131437776/nujoxip.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/4038548.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00006601.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00006601.bin)
    • https://s3.amazonaws.com/tunenijexe/astral_pipe_price_list_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/dixiporiwevakoluziwures.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/tumaropamexasaditemal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5289/8739/files/dovanigiluluzixekemeju.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/0879/0175/files/bread_slicing_guide_bed_bath_and_beyond.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0325/5205/files/rigemugobusoxofamutapasaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0314/9479/files/ipsec_vpn_configuration_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/bee_r_rev_limiter_install_r33.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 extracted file (font_00_sfnt_off00006601.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6601 5052 bytes
SHA-256: b31af3702d790f53320f9a6f53627574ec3eb4bcbcac61c22c8dde246ed30d56
font_01_sfnt_off00007762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7762 10132 bytes
SHA-256: 4ff8063103473bac0eba72fc6b64f56a69c1e47d773fd30b5d7c2f1a8bb38cb5