Malicious PDF — malware analysis report

Static analysis result for SHA-256 37e5aca6074c8191…

MALICIOUS

PDF

43.3 KB Created: 2020-10-18 05:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 86ccdf95b9eaeac00817fd83bdce031f SHA-1: 1061f796a23f3ca4b5846ab3bd6862b614ebd1ea SHA-256: 37e5aca6074c8191ca50f0af814065662d58c9de4df09fe7e47453bb3b6c52c0
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to downloading a manual, and the embedded URL is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious.

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.me/123?keyword=descargar+manual+de+electronica+basica+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f876211893e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f8763393a335.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379482/normal_5f8b2070b8ce2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370057/normal_5f8889f6590e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_5f894cb4500f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382960/normal_5f8b77a6ea2bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_5f8752e234470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5f8b4f0482a78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f88a56d041de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5f871e52874f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_5f8917daa5da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5f8b655f92535.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366961/normal_5f8b62c6f0157.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/42cdfb07-69ac-4af3-bb9d-212a7d667d08/best_budget_graphics_card_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48e0cb40-0e2b-427c-860e-b528fe0a9921/9538710692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab1b70cd-96ef-4695-8809-6e8b67c6aecb/pazowegenuwubitujugasik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/212db853-417c-47e1-b3cb-4aaf521890d9/mejodazanobitifilexeteza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93f9ae0c-4d2c-4cf8-a96c-19aaa13f0a37/guzofinixuvugupidap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77686ed3-7556-4040-9a69-dfdb2867cbf2/73430292842.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_off0000682c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x682C 5612 bytes
SHA-256: 69eae29965b9beb4a4d3e8567ca4cc600cc48aadbd4bc823d2ecbd0b4e3d1ab1
font_01_sfnt_off00007b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B24 10660 bytes
SHA-256: 08251c746059b2d7acc655921b8e2e0196daf3069d5450609b2700a623e48d48

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