Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd5846d5a7af328…

MALICIOUS

PDF

50.2 KB Created: 2020-10-15 14:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a1d5399dfe1a4a918e8cc97d7e29f7e8 SHA-1: 1ee0b7467292538c8a7ee3abd0010d5acce99cb0 SHA-256: ccd5846d5a7af3283269e90791b19881d0d94c093cf8864926a8f77e571a8cad
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The embedded links likely serve to direct users to phishing sites or download further malicious content.

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://cctraff.ru/strik?keyword=9.s%25C4%25B1n%25C4%25B1f+zamirler+test+pdf+indir In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f8728b7a8b8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366308/normal_5f876435d8ebb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366302/normal_5f87714672667.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366666/normal_5f8835660b228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369163/normal_5f87c4695fdd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366630/normal_5f878976989e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f87485c649ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366376/normal_5f87517503cda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f870e96eec90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5f876ff358e2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f87bf06cc02d.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/7e8d806f-3b0a-45e4-ab41-285bd51d5eba/89376074560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eafea91-0472-477e-ba3a-25a548343a7b/34965959235.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1698/6534/files/pikowudulekabederuvige.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/manual_de_soldadura_west_arco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5e3c815-eace-4522-8f38-2461f5ac1574/fofakodelosaforejipewov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe394622-09cc-4c33-88cb-7f39749ec3d1/muluzozidu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a0407c-4ee1-44de-ab4d-8ed1fb3612b0/82919767479.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E25 5360 bytes
SHA-256: 936f1aa5529aaeceebcec8ebe8402c7645248298774ad266a291b01f918e25eb
font_01_sfnt_off00008047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8047 11544 bytes
SHA-256: 78a791acfec25d287e68833c576db386feddbfec2533c557beac902f1a4c0885
font_02_sfnt_off0000a453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA453 16252 bytes
SHA-256: 92ccd17c7dcf4d1ab3e4a6e0dca9b280837f7f1712f9c5724e01b49c837636b9

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