Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaccc885952d44c…

MALICIOUS

PDF

69.4 KB Created: 2020-10-30 17:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: be4c5035cb37aa4d9a20b2d92f595317 SHA-1: 3b7c7a726e42e16a1cd0e001e5795fd54d31f797 SHA-256: ecaccc885952d44cd7feafe23e537fb67f2ca9bf02519d1d4d6db9a7444a34b0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is designed to appear as a "Triangle angles worksheet" to trick users into clicking embedded links. These links lead to a malicious redirector and a large collection of other PDFs, forming a link farm. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs and a link farm points to a phishing or SEO poisoning attack.

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/strik?keyword=triangle+angles+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_5f97ca8cd7dee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366400/normal_5f87420113776.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/1/0480/5322/3588/files/xowesikemejoniwezuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9353/1555/files/38658942655.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/s_kiu_truyn_phn_2_khi_no_khi_quay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/929d0c17-d831-48b7-abf1-2dfb7947e9e5/paveda.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/7296/1688/files/cpu_virtualization_in_cloud_computing.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3260/0985/files/mosifidajabekudawikisoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/2427/1525/files/kipetexasesixizunomufip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5296/4266/files/pebimawenibedaxiniliveji.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/3867/7441/files/jabesedorazolunateke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8985/2571/files/dmacc_to_iowa_state_transfer_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6248dc65-e062-48be-b642-a0c93673cbbc/5861197485.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_off0000c6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A0 4840 bytes
SHA-256: ebc031e20a6fcfa980a7b08b1816ce033491f5892266d6aa67dbed66f2745c33
font_01_sfnt_off0000d715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD715 11252 bytes
SHA-256: 9d7742e21910f8915e8165ecaa9d702ec375f86c826c859b111e5231139c603b
font_02_sfnt_off0000faec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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