Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9ed77d28448f2c…

MALICIOUS

PDF

47.8 KB Created: 2020-08-10 03:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 26750b40ff9f4582ce3c8ab9751d794e SHA-1: 67a129fd41a377800141d2203e7beb873b350659 SHA-256: 5f9ed77d28448f2cdd040eb1510514a68fab862e875ab863cbdfc40e8757749d
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • 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://ttraff.ru/pify?keyword=data+interpretation+pdf+bank+exams+today In PDF document text
    • http://files.luminousobscurity.com/uploads/1/3/1/4/131406520/75c90591b293327.pdfIn PDF document text
    • http://burep.htscounsellorcorner.com/uploads/1/3/1/6/131636664/1701336.pdfIn PDF document text
    • http://files.kapsilgreekspecialties.com/uploads/1/3/1/4/131406807/kirevadabax.pdfIn PDF document text
    • http://files.jagpetroleum.com/uploads/1/3/1/4/131438843/4531316.pdfIn 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://cdn.shopify.com/s/files/1/0455/3559/2613/files/30871647255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/90283382614.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/62510360625.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/ccrt_scholarship_form_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/modijur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9735/0554/files/34188639218.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3583/6059/files/dejodow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/tipos_de_materiales_compuestos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/248801138.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xedatojif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0877/6600/files/8163934174.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/gewebenanegu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8583/7989/files/basic_english_grammar_book_3_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000683b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x683B 5316 bytes
SHA-256: c141843c84ba13dacc8d977bff6606dc58d30d7e4a9e4f654f579ef85727cf87
font_01_sfnt_off00007a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3A 13080 bytes
SHA-256: e73cc895afc3815940240437794113881a294236ef4372670b8b7c315d70d855
font_02_sfnt_off0000a41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA41B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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