Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4a86d1f50eb718…

MALICIOUS

PDF

90.1 KB Created: 2020-10-05 17:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 753d9dc03ab58866b1ef6c27c03ce728 SHA-1: 92ae35177abd665c60dba37d33b6912fbc764d2c SHA-256: ad4a86d1f50eb718a675fbfa12323b8fac232d03e415e5688b67e882217e69e9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many pointing to disposable hosting, designed to create a link farm. One of these links, https://gettraff.ru/strik?keyword=federal+supreme+court+cassation+decision+volume+20+pdf, is identified as a malicious redirector. This suggests the document's primary purpose is to lure users to malicious sites, likely for further exploitation or phishing.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=federal+supreme+court+cassation+decision+volume+20+pdf In PDF document text
    • http://files.blissfulcounselling.com/uploads/1/3/0/7/130776655/832851.pdfIn PDF document text
    • http://dozujuxi.myvoiceback.com/uploads/1/3/1/0/131070374/ac1fc.pdfIn PDF document text
    • https://site-1042010.mozfiles.com/files/1042010/59514356756.pdfIn PDF document text
    • https://site-1036946.mozfiles.com/files/1036946/77684466836.pdfIn PDF document text
    • https://site-1038578.mozfiles.com/files/1038578/58050791401.pdfIn PDF document text
    • https://site-1041486.mozfiles.com/files/1041486/80618257682.pdfIn PDF document text
    • https://site-1036997.mozfiles.com/files/1036997/53666595549.pdfIn PDF document text
    • http://files.reflexinstitute.ca/uploads/1/3/1/0/131071256/1431724.pdfIn PDF document text
    • http://files.woodlandparkpack20.org/uploads/1/3/1/0/131070289/1134977.pdfIn PDF document text
    • http://kitaj.noramacquarrie.com/uploads/1/3/2/7/132740763/1374125.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/7c12cdc5-4010-4dd6-9beb-c02db32b8796/gukovuzigotabas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8824e502-7653-4354-8f02-b7403829feda/46889740561.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a9bde9-43fc-431a-9ed3-f35a082df1f2/44237606841.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8383 63204 bytes
SHA-256: 861960833d56e449bef381d4135f22a9acaf87cefe86ddc161794f8df8d61eb6
font_01_sfnt_off000124e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E1 5592 bytes
SHA-256: 9690c30de7941e2d7e0ec2e3966c4a9deaf888d02b2cbae4d7cf64d7ce41f4a3
font_02_sfnt_off000137da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DA 10500 bytes
SHA-256: ada61d6039c8f200dce6f7e2dd0ff81d639987a36bd72286c9fe88cfc8e520d3

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