Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1246335803a0071…

MALICIOUS

PDF

43.6 KB Created: 2020-10-19 06:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1d2f18aecfd11b82ab2227249a9e2585 SHA-1: 81297ad5aa4548d1815ba5bf294186c2c8958cae SHA-256: b1246335803a0071109e7c0b08d6ab343085417bb53aaaae2880bc6677e9a464
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://gettraff.ru/123?keyword=teaching+methods+in+maths+and+science+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating an attempt to lure the user to a malicious site under the guise of providing educational 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://gettraff.ru/123?keyword=teaching+methods+in+maths+and+science+pdf In PDF document text
    • https://kuromazu.weebly.com/uploads/1/3/2/6/132695519/juwedegiduwelo.pdfIn PDF document text
    • https://vekejuritikoj.weebly.com/uploads/1/3/1/8/131857631/5832748.pdfIn PDF document text
    • https://bizumoku.weebly.com/uploads/1/3/2/6/132681494/3307262.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/8282837.pdfIn PDF document text
    • https://jawowigo.weebly.com/uploads/1/3/0/7/130774982/09918f45b4e.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/pokobu-pidoror-pekirez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f8c8f090c87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f87e83d6a023.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/1/0502/9661/9193/files/nitro_7_kuyhaa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/2818/4739/files/most_expensive_dress_shirts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/bujuvilifagajezo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd30537c-1c34-44da-97a5-29a0f643928b/9705816733.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/428a6c6a-7cf9-4620-8d58-bf37b549e4b8/58074071080.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7848e9-b73a-43a9-a16b-f9eb2c87170f/44045282380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7021abc-647c-4096-b03a-53431f8ce15b/71713035543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca15ff40-962e-46f3-899e-f681837d3e16/pudixomeguwuza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/5654/4409/files/vamipoxe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5449/7443/files/struggle_for_existence_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/52061306320.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/1237/7754/files/tap_to_riches_mod_apk_latest_version.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0926/1220/files/guwikudo.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_off00006e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1F 5388 bytes
SHA-256: 9618bdb4095f59b776f81805867d90e8d4e60bca8be94fb85c09e954745f8888
font_01_sfnt_off00008051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8051 9584 bytes
SHA-256: 006cfcd7f884e8ff7e31ac19726d683ade85d805b9c3c56fcb551907cdec69d2

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