Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9b998e436d032f…

MALICIOUS

PDF

63.5 KB Created: 2020-10-15 08:32:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 29e622c7e41e7b5c4236ee27f241601a SHA-1: 34424b8060f01f7f1dacd34593d7034875f8a814 SHA-256: 3d9b998e436d032fff631a5d4fb84de966bcb651b8e08a3b92f5c9277cab137b
162 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files, forming a link farm, and one of these links points to known malicious redirector infrastructure. The presence of a 'download button' heuristic further suggests a lure to trick users into clicking the malicious link. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?keyword=tide+app+mod+apk In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/kadijamiruvinugeno.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/77b0c468a.pdfIn PDF document text
    • https://gurigibafex.weebly.com/uploads/1/3/0/7/130739571/sedomu_tetas_fijenif_malonakafeli.pdfIn PDF document text
    • https://redunexodozik.weebly.com/uploads/1/3/0/8/130814050/809ee8feae4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367648/normal_5f87750ab68cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_5f873fb4bb523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365562/normal_5f874c0b0c9e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f878329efa61.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/ed2f4e17-7b94-4940-8f8d-5def6f52197c/jasamo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8858/5921/files/katofegap.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8622/4791/files/nefera_de_nile_and_cleo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0693/4178/files/powers_of_2_table.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e735709b-c444-4b02-b468-d115790c9c99/fafuvasa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a74c3ef9-9f79-4ecd-a96a-eab1aa50f5cd/paxevataxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfa83b4c-46b9-4cb4-9c56-8f2413226547/jamasopetike.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0981/8280/files/newexuvobif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/7899/9960/files/93823030270.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000beff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBEFF 27784 bytes
SHA-256: 6e741b940c75a2c06509dcd9f4cac523fe0bfe12cfcb6ba8bc6fcdfda1d8c2af
font_00_sfnt_off000088f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88F1 4812 bytes
SHA-256: 864a82562313407fec7de567d306d980d932a78ef35dfae247ffb3b8203833a7
font_01_sfnt_off0000993e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x993E 10996 bytes
SHA-256: 02783af16974bc01edffbe3d5b966c666db856220190be3124861d5fb92c347f

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