Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ecaf75cbcf39a5d…

MALICIOUS

PDF

55.0 KB Created: 2020-10-26 12:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7c62aa23dacf7231180105ab8c366b52 SHA-1: b76362a03564f490865a4b32f2647348dd1f91ce SHA-256: 2ecaf75cbcf39a5d9946b210f08a751d9d7840299b1e7c57357a3b142f18dc3a
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector infrastructure known for malicious activity. The document body, though obfuscated, contains a URL that is also present in the heuristics, indicating a likely attempt to direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

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://ggtraff.ru/aws?keyword=bennett+mechanical+comprehension+test+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f8fe6d8da227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365576/normal_5f88cd1d6ff4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f8c1b814c7e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368955/normal_5f879b3c68fcb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369923/normal_5f8dd65578a8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0266/9333/7264/files/rasesewawanaxezeboxet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7367/0820/files/marketing_plan_for_education_consultancy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/057b41d2-82af-4963-8a9e-676717b87610/8983275207.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b14908e3-6fd2-4b5d-8a5b-5ef7d0e0a591/73719533305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4210f31f-0bb2-4ade-9b81-f6d592e7bb18/nusanosapanomapimubivu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5407/8871/files/wimipebazuboj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7584/3736/files/kisijeledoxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/0587/0758/files/wufifubibaxav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/743ec955-830f-49c7-9fd4-e4f04c6904e7/amazon_fba_product_research.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e5f1db6-5bb9-4a6a-9952-de7af5a0cf38/49322175694.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/519cb81b-fd51-4b34-bb4b-7420e92991df/32881560949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54ace1f9-24bf-4555-afd4-33ed676ef8fb/vubabanuxoxakudabiga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7831/2625/files/rivunon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/1442/4229/files/screenbeam_mini_2_amazon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4041/5644/files/91842348098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8521/5940/files/sowetamapidetelimipuzuwo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8930/4994/files/8634035904.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_off000088a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A2 5232 bytes
SHA-256: e3f6b0bae4ae1ebf9a2a4e46b89055fd3c5ce94a21ae50c49d94797ceea066a0
font_01_sfnt_off00009a29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A29 11164 bytes
SHA-256: 64c33e80cdabed3fab3e9c3b1748ca3118915a7347a51a53f19c5b43ec59b535
font_02_sfnt_off0000c022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC022 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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