Malicious PDF — malware analysis report

Static analysis result for SHA-256 230931ba1d90ba55…

MALICIOUS

PDF

47.7 KB Created: 2020-10-28 23:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: ba669cf1e50ec0e8e2523b77d0952550 SHA-1: d610ed6b3aef6bebd132a478ea9e1b366f4fa039 SHA-256: 230931ba1d90ba553f09403cb994403bf00cecbb307def1af673eb47e27c04ad
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains a reference to the same URL. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a broad distribution attempt.

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.ru/123?keyword=primary+chords+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404964/normal_5f9783504e497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379219/normal_5f9614638e210.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/1/0502/7073/2456/files/94587714948.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/huduma_registration_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d4f3f66-5d4b-4374-9a50-6cff009a24ce/vixaguzoga.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/carson_dellosa_interactive_notebook_language_arts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b136039d-0b85-46fd-b864-ab0f9eefe1ce/genaratas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/0497/2186/files/waterless_dog_shampoo_wipes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb854ec5-c944-4c7e-868b-1e04081cc2fb/27700775574.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/7374/7140/files/teligugorus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7877/9047/files/aluminium_profiles_for_windows_and_doors.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/34578144790.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0334431-8a6d-4742-8449-16a024dc1083/sobijazegolaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5482523e-b641-4a52-8f6e-c460e294989b/88077645693.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a50ce9e-632d-4920-98c1-ff928b9aa6b7/wolagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2172/9955/files/divinity_original_sin_2_enhanced_edition_crafting_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/4080/2469/files/jagojivejixixepexixijatom.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/supedidowojero.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0587/6123/files/25554891052.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2734/7109/files/magasawokapimetigilu.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/zatobutofixaxado.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_off00007907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7907 5408 bytes
SHA-256: d10f1edd5c0f80486229ed9d24ce410c923920a71f2bc33e8f9c4870739b1c9b
font_01_sfnt_off00008b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B51 11288 bytes
SHA-256: b78aa832b3be853db97f71a8aa3d92686e9f8ccab62036c0bb7a70b935e25e5e

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