Malicious PDF — malware analysis report

Static analysis result for SHA-256 381ba02f6dc2f91b…

MALICIOUS

PDF

35.9 KB Created: 2020-11-01 05:12:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 088f5e8de24104f64c47e93bd8d111cc SHA-1: 34e5728724f4a605630b6b30e05acd00f969d0d4 SHA-256: 381ba02f6dc2f91b0c179521df566e572c818de48eba93e30b35ac8ea0a73262
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://cctraff.ru/123?keyword=unit+2+test+study+guide+functions+and+their+graphs'. This URL is presented within the document body, suggesting a lure to trick users into clicking it. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of a malicious URL within a PDF is a common tactic for initial compromise.

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://cctraff.ru/123?keyword=unit+2+test+study+guide+functions+and+their+graphs In PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/b4e6966cf639ec.pdfIn PDF document text
    • https://gozofuma.weebly.com/uploads/1/3/0/8/130874065/541746.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/xojafemori/cutaneous_receptors.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5105/6804/files/cub_cadet_i1042_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/binomial_theorem_objective_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c4f0ae1-8200-44a0-a9b6-6aa6a56540c7/40689214183.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3ffc27-04cd-4ec2-919c-c8cac17e7023/pewikigujig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35590167-9d24-44f1-9326-562a12ba5162/28735496228.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/the_field_school_chicago_tuition.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/literary_devices_used_in_success_is_counted_sweetest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/488ba493-70b0-4693-9e44-8d5a60c8ab92/83522680978.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_off00004a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A78 5608 bytes
SHA-256: 45d4547c4b795e50d4e8dc131acf55203fffc911de8560412e57441afe245a36
font_01_sfnt_off00005d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 10260 bytes
SHA-256: 4f0850e6f7b9ea18eec498dbc34f5e4edbb85599586c045ba433c3a99b37c0f5

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