Malicious PDF — malware analysis report

Static analysis result for SHA-256 6667a94d1350aa39…

MALICIOUS

PDF

40.7 KB Created: 2020-10-23 05:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 276fc17c94b399600644fc385e4a9689 SHA-1: 9675c419eabbac2276dae9947f711da7c0707f11 SHA-256: 6667a94d1350aa3909bf80a7699bd0c94099ebcdf4d637bc88d163dada008cea
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, disguised as a tool for merging PDFs. This is supported by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the embedded URL in the document body. The presence of numerous external PDF links suggests a link farm or SEO abuse tactic, potentially to distribute further malicious content.

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 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.
  • 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/wb?keyword=merge%202%20pdfs%20in%20adobe%20acrobat In PDF document text
    • https://cdn-cms.f-static.net/uploads/4391909/normal_5f8eaa4d7d3dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390071/normal_5f924292f14a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f8b9ea577841.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384029/normal_5f8d00331871c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_5f920d8d0190a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_5f8c406777c3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369907/normal_5f90497def88b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/libros_de_fibras_textiles.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/katalog_toto_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/mikorudomesoxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/ginawimuwotofigugujavuka.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/2254/4807/files/fidapesuloxemij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7085/2762/files/sociological_institutionalism_and_european_integration.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2836/3439/files/family_members_worksheet_for_preschool.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1376/6820/files/quasi-experimental_research_advantages_and_disadvantages.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/278a0745-afa7-46c3-8644-764530582d81/jefuseguruv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52f5161-0f7e-4115-93d0-3192213c7c49/honda_gcv160_repair_manual_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/ritumidikekipebosone.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5935/2990/files/renewable_energy_sources_engineering.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9564/6101/files/golden_lasso_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/anti_obesity_drugs_list.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0648/3876/files/craigslist_mpls_st_paul.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_off0000603a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x603A 5568 bytes
SHA-256: 1d9ed6ee36564a3d0fe25aff8b077162083d16b68b755f785ca23b1674edf9ad
font_01_sfnt_off00007348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7348 10064 bytes
SHA-256: 396bb52cb8fd9fe238a55bcdf0f5213c9b805eafa4c9f8db09a7605a7ce97938

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