Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b362b14125a5cc1…

MALICIOUS

PDF

58.2 KB Created: 2020-10-27 16:11:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ef5f4ada7caea8ef82fb5ded4f195e03 SHA-1: eff6c37626eb06c65aac1acc66323bbd55f961e1 SHA-256: 1b362b14125a5cc1dd1789486e334518711ec7121d43f25de0cb73d1d3cd7257
94 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded document body text, though partially corrupted, includes the same URL, suggesting it is the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious URL within the document points to a phishing or social engineering attack, likely delivered as an attachment.

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://ttraff.club/123?keyword=bdo+warrior+crystal+guide+2020 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zetare/makalah_abbasiyah.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/82750433902.pdfIn PDF document text
    • https://s3.amazonaws.com/vuzufexarevima/18216006891.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63ca4a2-1ed0-4dca-b045-10734cbdc14f/gogujepu.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/finance_clerk_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/doterra_cedarwood_essential_oil.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/xutubakakewimasukilez.pdfIn PDF document text
    • https://s3.amazonaws.com/rowubunak/24816156884.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/container_dimensions_metric.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76fd642-199e-4e12-9161-e369a084191a/25048465820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7e348e5-7a6a-45f7-b08d-9e868b0d0784/fuxikinowapajeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd8e1325-7107-43d4-9a1b-1adc30dfa37f/mebesiderolexemal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02a84af4-1b00-4c22-a6ba-ef64126d8007/gurixaxaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c17b9b58-f984-46cd-b548-eb6cc1ab8d9b/rezetigakagozisat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0B 5400 bytes
SHA-256: 3f61986a021024b3a0b2034f6c755de4b315946ea5ba24c5f812861bdd2f8b35
font_01_sfnt_off00009d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D8E 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off0000a61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA61B 11544 bytes
SHA-256: 95c67b7bdc29ce8a73e4a896a4809b1867322171356b11b50d6c7186acf34d75
font_03_sfnt_off0000cd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD78 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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