Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecfe7c423a186c1…

MALICIOUS

PDF

47.1 KB Created: 2020-10-16 20:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 87bb70ad9fb2666ec5b4946a4f89e8e9 SHA-1: 16319e2cfa6d83c4d387dde538db420d7e1fea06 SHA-256: 1ecfe7c423a186c1630cd3643ff5876aa4a0d849d96e5afcf1f7f0edb1a5dd87
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to what appears to be a link farm designed to obscure malicious redirector infrastructure. One critical heuristic identified a link to known malicious redirector infrastructure, and another flagged the document as a PDF SEO link farm. The ML classifier also strongly indicated maliciousness.

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://ttraff.me/123?keyword=mtg+arena+android+beta In PDF document text
    • https://bedizegoresupa.weebly.com/uploads/1/3/1/3/131379398/1696278.pdfIn PDF document text
    • https://renesixedobalew.weebly.com/uploads/1/3/0/9/130969137/92dccdf.pdfIn PDF document text
    • https://kinojapi.weebly.com/uploads/1/3/2/3/132302846/jigaxewiwokoxuriwi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f878e046331f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367914/normal_5f87be37832b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f89833c08896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_5f88bca967fa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5f87d91e50e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f87d92a0d3d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_5f89120db2f7e.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/1/0266/7613/4082/files/59414382432.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/6029/2515/files/safe_debt_load_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/6619/8682/files/army_prep_drill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f5da440-867a-41ed-82d6-26cf412996a2/44706196800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5da7ba05-afef-4caa-bd3d-08dbd9040363/26208727889.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce437ddd-7f2c-4d4a-878d-9977565bfa9e/14679775306.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78910158-097c-4206-85cb-53f189698eb3/55188885273.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59fcbb92-e6ae-4dc6-b732-86889bb5102b/20199604350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/befcd469-350c-446c-b50b-31303415dc38/jolowodabiliduwojejegejir.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_off000079dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79DD 4928 bytes
SHA-256: 579615987027a077fbf4850edbb57443d4b5f174550aa6d0dc17016a7e79cd04
font_01_sfnt_off00008aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AAD 10592 bytes
SHA-256: bc717a216f9a90e408a26271d43d1c75c872a3a610a6ee03fad0a7a120bd57cf

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