Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be9719f2ac68411…

MALICIOUS

PDF

42.3 KB Created: 2020-09-30 06:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9fa584130f777950f4c34362273c622e SHA-1: 84777bb9fdf685a0983996a9af7ee5ed75dd15e7 SHA-256: 3be9719f2ac68411b9b7a0ea5af91284769d589882b36775908dc80805d148e5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, indicating a link farm or SEO spamming operation. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious content, possibly as a lure for further exploitation or malware delivery.

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://gettraff.ru/strik?keyword=astm+a325+bolt+specification+pdf In PDF document text
    • http://files.manicatmidnight.com/uploads/1/3/0/9/130969535/parabinin.pdfIn PDF document text
    • http://files.streetwareaffiliated.com/uploads/1/3/0/9/130969489/1193008.pdfIn PDF document text
    • http://pawuwez.cantonohiolandscaping.com/uploads/1/3/0/7/130776321/3998718.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/3631287e-348e-431c-b2bc-021dad67f14d/95990220838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/702e0060-ce19-4498-8688-e097795fef5d/fedaramulaxam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da1309e-cf4e-46a9-8684-7ad5bf973960/13905369452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdefe674-1999-4eb6-b480-b4cd19ba1432/rowexuga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38436d0f-65f5-49f4-b2bd-c127d0018bdc/70116885201.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99eb8903-c3c0-4733-b227-fb1ddafb1461/9383820358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/846f40e1-4cb4-4955-a6fa-a6b8658f09bc/91334244667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94c8ef96-0ebb-45e8-b131-31ea20f23524/39309591886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aab3e44-3086-451e-9dab-a4db68ce9e98/mupubupojov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f112accc-4063-4a7d-9068-5944f51f8a9b/rovewevavulomipolifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40162786-7771-4146-989e-edbe7666e05b/vagejadipuwelokuzojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93850ef5-f7df-4636-a293-08eb89ff8d63/vijafowekum.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_off0000640c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x640C 5756 bytes
SHA-256: a5dd9fea4b891f0e57906162181a5017e7efe033586d875b2c1a468b828a4a84
font_01_sfnt_off00007794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7794 11024 bytes
SHA-256: 727e9082d3ac3a7fee22d7993acaed4ad0d04dbd44a191218eb040806199a4c7

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