Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a7da3bb854f102…

MALICIOUS

PDF

43.5 KB Created: 2020-10-19 17:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 540da19214acbd9fdc97efa1772be064 SHA-1: e0b86f8ba99f02c7c9e37556d6d9666ee3c30dd9 SHA-256: a6a7da3bb854f10210fd261e09bc58066c34f93fb1b4f77e29a08028ab8c9cf8
192 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gettraff.ru/strik?keyword=kickass+search+free+movie+download In PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/9706758.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3355978.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/40a89f041c581d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f884aedc986f.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/1c8c227.pdfIn PDF document text
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/e1f1745c41.pdfIn PDF document text
    • https://pudukodup.weebly.com/uploads/1/3/1/4/131407572/mujove-nejetiteve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365589/normal_5f880d193f8fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366989/normal_5f882fe10f6f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f8abc6d5f508.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_5f8d67bb95dc0.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/1/0488/2363/2037/files/68194277069.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/5362/0644/files/paluperu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9576/2094/files/baby_sun_conure_care.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/bujuvilifagajezo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7733/6224/files/19753076971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/5849/0275/files/medicare_non_contact_infrared_thermometer_instruction_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0607/3759/files/craigslist_dallas_bikes.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_off00006b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B64 5448 bytes
SHA-256: 0e4d9333ceac8d8b857439128eec3a556e1b7ab854522d2891a0c48fecc3efb3
font_01_sfnt_off00007dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCE 10344 bytes
SHA-256: 048d30f43147d19fc76831f3145f457cc95464bc49aff8c5ff8a94423f72942c