Malicious PDF — malware analysis report

Static analysis result for SHA-256 391553404ede437b…

MALICIOUS

PDF

52.7 KB Created: 2020-11-02 20:21:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 83b2e1eca2958a32f0d190ce8959c612 SHA-1: ea75565ffd83f568853cf7a67cf1a2b6380deee3 SHA-256: 391553404ede437bc1d78db826089e596c231e26c6e0ff69fda313abecbe35c8
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged as a malicious redirector and a link farm, indicating it is designed to lead users to potentially harmful sites. The presence of numerous external links, including one pointing to a known malicious redirector, supports this assessment. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's part of a phishing or malware distribution scheme.

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=scott+county+middle+school+facebook In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e317a5f-2add-4428-9dc2-ba5baa6a0279/tanoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1712/3486/files/manual_prctico_de_medicina_ortomolecular.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7841/0136/files/properties_at_wright_field_power_outage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07405d98-f124-4fc0-a3ed-7b0308ed3bed/74051082098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1746/9086/files/832347495.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4224/1188/files/fieldstone_middle_school_website.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/8443/8432/files/17633164849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b366fcb9-e009-40cf-99a7-06dfa070acec/84099672597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc28d6ab-49f8-48c8-804c-3bf38f9fda23/happy_25th_birthday_wishes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4916/2654/files/83995107358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b0286d9-8d2c-4661-a9ea-d4098850b149/daycares_in_strongsville_ohio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6112/4008/files/non_domestic_building_services_compliance_guide_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/0880/5029/files/53410441991.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/scripture_noah_preached_120_years.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_off00008ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF4 5572 bytes
SHA-256: 605365f7304186436cccbcbfcb583e8637f4c414fb15198bd40912fa062227e7
font_01_sfnt_off0000a2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2CD 10212 bytes
SHA-256: 768aa7d11619dbc35f2b276f75d150514f46350f24806693f1cc83eb889fc765

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