Malicious PDF — malware analysis report

Static analysis result for SHA-256 41ddb5e36af98678…

MALICIOUS

PDF

221.8 KB Created: 2020-11-09 16:03:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6a4ed6f967b27f6217f2cdfcc9606b91 SHA-1: 29ecca0960b73b97e8602bf4812879d3533e73f6 SHA-256: 41ddb5e36af9867836fb5575a22ed3bf9453b290e9ca0cec3c17698becc1a38d
94 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that masquerades as a vocabulary worksheet download. The ML classifier strongly indicated maliciousness, and the embedded URL points to known malicious infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to lure the user to a compromised site, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?keyword=11th+grade+vocabulary+worksheets+pdf In PDF document text
    • https://fenawivo.weebly.com/uploads/1/3/4/0/134000055/wesikokuw-gowuge.pdfIn PDF document text
    • https://valakafugajebe.weebly.com/uploads/1/3/4/3/134330742/0957cbcbc1c.pdfIn PDF document text
    • https://gexirirexov.weebly.com/uploads/1/3/0/8/130874239/futifofadizalutezi.pdfIn PDF document text
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/juponas-jolixepub-suzemojotoliwo-pajunizo.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/lunibafoxokit-jukokopipum.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/mesewifutiko.pdfIn PDF document text
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/naratozunoluwukin.pdfIn PDF document text
    • https://folesatabija.weebly.com/uploads/1/3/4/4/134441350/nepon-pevataje.pdfIn PDF document text
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/fusimurapoliv_pegugepove_vezumimegaz.pdfIn PDF document text
    • https://zukamukenipebo.weebly.com/uploads/1/3/1/3/131380388/fagol.pdfIn PDF document text
    • https://lodinewonob.weebly.com/uploads/1/3/4/4/134475472/mevuzazip.pdfIn PDF document text
    • https://paxiguvemogi.weebly.com/uploads/1/3/4/3/134317910/kinebewojozililuwid.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/debe5afd-a647-472e-8509-17ed020a0489/golds_gym_xrs_50_exercise_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58498404-843c-4176-928d-34fb749f0702/dakovimogilebog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea10949d-5749-4cc1-9f42-a4c27022f11b/55248637683.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0186f9d-6952-49a1-8589-7c6b8f569969/51094162737.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_off00032fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32FD4 5832 bytes
SHA-256: a98c10a0898413d09165492117b60ed39e74a1ec117fe6af2f2e178868349efb
font_01_sfnt_off000343ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x343CA 10904 bytes
SHA-256: 6effdd564d628f776997c9b2520be5cef8d464afa114cd53785e8d25b8ce8dcc

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