Malicious PDF — malware analysis report

Static analysis result for SHA-256 40e283b02ed5b416…

MALICIOUS

PDF

45.4 KB Created: 2020-10-31 04:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e03d792abe68c20df2958d43648ca0d2 SHA-1: 99c23754617a6412ec562db54b0abebe9116d939 SHA-256: 40e283b02ed5b4164508f1423571d17a03f981cc32c4236745fafd33a55f06c7
154 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'US sentencing guidelines worksheet' and includes the malicious URL, suggesting a phishing or scam lure. The ML classifier also strongly flagged this PDF as malicious.

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://cctraff.ru/pify?keyword=us+sentencing+guidelines+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5f93430daf3d0.pdfIn PDF document text
    • https://xanodupujariris.weebly.com/uploads/1/3/0/9/130969381/taxego.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/wisuw/lopressor_davis_drug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c538ad3b-ca68-4391-adef-597fb4fcf6f7/pogipokanabikufesuvu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/83433449070.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/wajagajaxotuwawolodaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/reading_comprehension_exercises_with_answers_for_intermediate.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/mukor.pdfIn PDF document text
    • https://s3.amazonaws.com/mamukawaxatali/18411022080.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/7526391336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4566f9cf-63a1-4d45-bb37-c32e36479fe1/29979379869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9626c5-b2ec-46a5-bdb7-c4d0b6f8a45b/28308412831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d9f3a0d-1faf-454e-85ea-cbf484b0e0d7/64831094145.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_off00007258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 5136 bytes
SHA-256: 5fc3cba72a5d3cd22ea0d39152363cd5ceefada95d1423ece5ebb25195d14fd3
font_01_sfnt_off000083e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 10236 bytes
SHA-256: 7bdeff5d2d0f94e3a5b310f07003fbd15bdd651ed72eff6c0793110732b2bac0

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