Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8b4e4df5c2500f8…

MALICIOUS

PDF

58.4 KB Created: 2020-10-11 11:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 359dc72f7ac815c63c1892fc1cfdbd70 SHA-1: 166971a8d5cc29b35c46131f1c7855e020c73dd1 SHA-256: e8b4e4df5c2500f8f2c2367022aceb95ed3a0e96e3364759115c6ee2cabdd24d
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://cctraff.ru/pify?keyword=street+dance+of+china+3 In PDF document text
    • https://site-1043572.mozfiles.com/files/1043572/bozumoguzexojinoribeweti.pdfIn PDF document text
    • https://site-1037846.mozfiles.com/files/1037846/66709268370.pdfIn PDF document text
    • https://site-1043158.mozfiles.com/files/1043158/24777048186.pdfIn PDF document text
    • http://files.hypertubes.com/uploads/1/3/0/8/130874510/5f7f022cab6.pdfIn PDF document text
    • http://files.retrochem.com/uploads/1/3/1/0/131070317/f4dd4584.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/1/0482/9688/6434/files/wekuwupatipuxafetukagas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7050/0263/files/moment_of_inertia_about_y_axis_of_triangle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0487/9522/2181/files/concentration_worksheet_key.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/27411464716.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4987/7143/files/australian_key_blank_conversion_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1258/7159/files/holt_mcdougal_biology_textbook_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/2737/7561/files/84374788222.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/11373610663.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_off00007938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7938 9296 bytes
SHA-256: 2eb0ff42a9152d805b91a23ba4ee3d754926cb8d4d795b3c7621f413ea21692f
font_01_sfnt_off000097d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97D9 4952 bytes
SHA-256: dd358de09802dd98f5d993455d2b73795334301bc74887cf4b95cb52e433ebd4
font_02_sfnt_off0000a899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA899 10700 bytes
SHA-256: ee0bb62267c98ed9a6c585896faff74cd4fbc288ab1d54b4481c11c64bfd2235
font_03_sfnt_off0000ccff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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