Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53f350db76a59db…

MALICIOUS

PDF

36.2 KB Created: 2020-10-29 00:18:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: af22e8e4b414d75b4e41a5f7674566ac SHA-1: 9edfd02ce71e4d5ade16a59fcac0fc70d2e1c41b SHA-256: b53f350db76a59db6b80b5d0202baecee899ec38e9977b64db66e3fecbbfd0ae
94 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised within what appears to be document content. The ML classifier strongly flagged this PDF as malicious. The embedded URL is likely intended to redirect the user to a malicious site for further exploitation or credential harvesting.

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://gettraff.ru/strik?keyword=periodic+table+symbols+and+names+crossword+answer+key In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8b4b500ef9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8f4542e3f90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417644/normal_5f96fb07b52b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366047/normal_5f876607cec35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5f8c9ca31c210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5f8c003a6a922.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417818/normal_5f96430dce03d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366032/normal_5f8a7d976c285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_5f96522f2308f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380858/normal_5f933236cbefb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f99eb8fd0d69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tefelaj/budet.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/pathophysiology_of_asthma.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6995179-822b-497b-a957-29df015a3237/45202776739.pdfIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/rekuji.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/xibat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8248156a-d44b-4a6c-bf28-20b4a0bc1b33/7789859471.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/basic_knowledge_of_civil_engineering_for_interview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4bf67fa-6180-4c87-b7f8-a120a9dbe491/wiwefajuvemotivabal.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/mens_shirt_cutting_pattern.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e12c722-d8dc-4c5e-a12f-73c28a00d954/guide_gear_teepee_tent.pdfIn PDF document text
    • https://s3.amazonaws.com/zetare/favokusowezejelemone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08c082f4-e553-4067-a3b3-2a3b3cd2b14c/jopifewukexaxodesividedo.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/vetejoresonixiwupifize.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_off00004fba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBA 5484 bytes
SHA-256: 98d4263090ef08ad08b09f299e38d4e5c40dc3544afdcc106ebfb148bfac63f1
font_01_sfnt_off0000625a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625A 9728 bytes
SHA-256: 0d45bc6b234a300a14d6050bb51e2e9b3bfbfd5cf16865507c30e0094e20bfd5

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