Malicious PDF — malware analysis report

Static analysis result for SHA-256 c777822a759e211e…

MALICIOUS

PDF

46.9 KB Created: 2020-11-02 04:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1b624b7bc90e5151ab145018aa03bf83 SHA-1: 8fff5ee713ba04a037520a060a384fef4309a769 SHA-256: c777822a759e211ef2f5f6640b2e3fdb767512a0910143f7ab7b09aa5b379316
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded URL, 'https://ttraff.ru/123?keyword=harkins+theater+prescott+valley+movies', is presented in a way that suggests it is a search result for movie showtimes, likely to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be a social engineering lure leading to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=harkins+theater+prescott+valley+movies In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_5f99e799e2a8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369631/normal_5f8c337ee0de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368767/normal_5f9a1df92ffd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392649/normal_5f94c9437bbae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368495/normal_5f93790867486.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_5f8c01631dfb6.pdfIn 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/9003409e-1194-4bb1-ad5f-f14de28c053a/91312525775.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/autoit_complete_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23de3890-c525-44ad-8a55-308cc568cc75/pitegusozi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/78923883973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4043b48f-1f2d-485a-aea9-b0b0ec981806/nelazulevena.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b925571d-b6ba-4aa6-84e6-2d2c5bbfacdf/xelifutujabiwodofom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbafa439-8cce-44f9-b768-e0bcc7bbde43/anatomia_adenoides_y_amigdalas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4730/5635/files/hippocrates_on_ancient_medicine.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/home_depot_equipment_rental_rates.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/5004/5092/files/49511261550.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_off0000795e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x795E 5360 bytes
SHA-256: 4ed34040eec16f5a2a8b14e3ee00dbe9179e5f8107c7c14881017033aabcc0db
font_01_sfnt_off00008b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B7C 10112 bytes
SHA-256: a4a096b94681596dd7f197033851ce8a3c994ed87e3cc8f9685eab61b8e684ae

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