Malicious PDF — malware analysis report

Static analysis result for SHA-256 022c1bbed7441270…

MALICIOUS

PDF

55.8 KB Created: 2020-10-28 01:51:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e1dd1e4b2dceb8c91e0cfb52094cc9e4 SHA-1: 931a34123c1d5fa9b26df4f6bd8cb0d4bb03917a SHA-256: 022c1bbed74412706ee730920dbfceeb819070d90edf618a8e28870a20b4414f
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to known malicious redirectors or disposable hosting. The ML classifier strongly indicates maliciousness. The document body, though obfuscated, contains URLs that are also present in the link farm, suggesting a coordinated effort to redirect users to potentially harmful sites.

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://ttraff.ru/123?keyword=manual+cuisinart+coffee+maker In PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ratot_muweliwamopoj.pdfIn PDF document text
    • https://pavowojavujide.weebly.com/uploads/1/3/1/3/131398322/semujojozofosuv_vavuvozija_kabuxasu_gomoporenedivu.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/3795560.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/ladefubit-tafojapumepokan-vowupe-zidedix.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/89eebe13248ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8fc18723e9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_5f93b6a7ebe2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5f8ae68252a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_5f8e8785dad21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f875055d3c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5f8f6f60ab67e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387040/normal_5f8f4c67a47f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372080/normal_5f8f1a446bbf1.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/5a9a6a68-0ca3-4241-896d-f3c4a25ca147/lorumev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/347dc42d-fe03-4929-b8d7-ceed92c3b430/gisisipozitazidam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4aad31-387f-4c29-983a-9aaf2b480807/keloxelubevokiji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d36bb0e-7030-423f-8379-b94283b1597c/85712213100.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/1661037090.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/residential_buildings_types.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/35639760475.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/0370/6006/files/wipasesa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/jebuso.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5041/7307/files/blood_and_chrome.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1E 14936 bytes
SHA-256: 803192e1cd229427561bef55d8fbbbaefbe76fddf5f3094384a6e3bd7c004699
font_01_sfnt_off00009bac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9BAC 5096 bytes
SHA-256: b110fc2c283e5bd4ce8aefae5bd729c6846b2e43729695791c1c39dc2071b49a
font_02_sfnt_off0000acec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACEC 10584 bytes
SHA-256: 2150021e5a64d42e9a64b1650debfb54e73d1163f44cfa6a0f32ba880bf2b042