Malicious PDF — malware analysis report

Static analysis result for SHA-256 920e4bf367049a11…

MALICIOUS

PDF

46.3 KB Created: 2020-10-03 05:49:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d22f34e7c50480ff828461f1fee89c60 SHA-1: e84ad04826592b37c49a44ce0b545d95146a0ef5 SHA-256: 920e4bf367049a11de0c239fdc418d4c18bfc852d0696edfe5ec9a07834569ca
134 Risk Score

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?keyword=nctb+class+5+math+solution+pdf In PDF document text
    • http://files.celebratesuccessbenefit.org/uploads/1/3/0/8/130874284/63967.pdfIn PDF document text
    • https://site-1036684.mozfiles.com/files/1036684/gitekuduvi.pdfIn PDF document text
    • https://site-1038558.mozfiles.com/files/1038558/vurabaxubuxudebawofanunit.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/76ab9924-57de-49df-b94e-c5fa9cfa56ed/6974424123.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debb85dd-00bf-42d5-87e9-4d2cb20392ce/nakunubotamafuperisal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e1d9a67-6c72-409c-af6c-a18d59a270fc/54039573187.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8717/0210/files/towel_drying_rack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/go_green_contracting_staten_island_ny.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/0232/3094/files/classroom_assessment_scoring_system_class_manual.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5708 5532 bytes
SHA-256: 081d55bd99b00c6c394bab0f6988cab2acf03dbccf66523ed4ed8daf7883c833
font_01_sfnt_off000069bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69BC 10036 bytes
SHA-256: 3af5ab8ca6496f90be6af0cd1d896f688a856e9367761cff9146e5052825afab
font_02_sfnt_off00008973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8973 10252 bytes
SHA-256: 67a84c2052d5459fc7da4810eb4c835f5bbd9184d3b9f31bf58d3ab33928530b

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