Malicious PDF — malware analysis report

Static analysis result for SHA-256 71257235a552dce8…

MALICIOUS

PDF

40.4 KB Created: 2020-10-18 04:40:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 42944b13e51da4109f1ec504c29d5be9 SHA-1: b42886b1b809bdb3bf3f9fe0cfdffc374eebe4c3 SHA-256: 71257235a552dce876793d8a421e086386b9ccec73265b38611ff09776034d5d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded links, with many pointing to a redirector URL. This suggests a link farm designed to obscure the final malicious destination, likely for phishing or malware distribution. The ML classifier also flagged this PDF as malicious with high confidence.

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=empire+of+the+sun+awakening+mp3+download In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/wokokagegegaxopefus.pdfIn PDF document text
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/9bf80f98126adc8.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/1473354.pdfIn PDF document text
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/1957136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f876357a291f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f875ba4bcd5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367633/normal_5f88497b6ee13.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1d44b872.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/zevarezoj.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/sulusilalope-jobede.pdfIn PDF document text
    • https://rajomiluti.weebly.com/uploads/1/3/2/6/132682989/3810973.pdfIn PDF document text
    • https://tajurasexir.weebly.com/uploads/1/3/1/6/131606020/4021379.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/sumaxika.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/mifujulopesoxel.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/rewizu.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/kowemelujolataj_wadenolipomixa.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/4270367.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/02d56c78-e9c4-4059-9cf3-38a24d748e27/72252505448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/325be4f8-a496-42f1-aa16-4d93d85fc3dd/galorinudobirelavu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e130cb-b45a-45b3-b658-fa7b61b5e997/walalakuzoruteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d262d14-3e19-4816-8f32-d5bcb94b1984/wasosikuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98cc2ab6-677c-41ee-963b-e6987b411815/rewazobowulikususob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0465/0860/5590/files/comparative_guide_to_nutritional_supplements_2017.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7808/1959/files/gta_vice_city_jetpack_cheat_code_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5019/6903/files/samurai_buyer_misaki_website.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7673/9770/files/full_form_of_banking_related_terms.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_off00005ba4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA4 5732 bytes
SHA-256: 9f28320276fc9d0835cf198e62c40c238a62f79a90ec024460a424c9b6dacf4e
font_01_sfnt_off00006f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F16 11668 bytes
SHA-256: 7e62a739f09509a014a2ef2807471db5b515bb6e48ef29ffca6474ce86eb79de

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