Malicious PDF — malware analysis report

Static analysis result for SHA-256 4821f93c128aee88…

MALICIOUS

PDF

43.0 KB Created: 2020-08-12 09:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 5e27577044b89e6b070b3fec9e7073e5 SHA-1: 6cf3783434f3c121b7b919fe81689ca79a2e8cb9 SHA-256: 4821f93c128aee88e33014b46c01a3fbb9b4847c35403d5f85032a86c7dc8764
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.com/pify?keyword=international+journal+of+applied+mathematics+pdf In PDF document text
    • http://files.dremasmusicstudio.ca/uploads/1/3/0/7/130738889/kapesoji_tutorobobuwu_kekirixamu.pdfIn PDF document text
    • http://files.majesticgodscollection.net/uploads/1/3/0/7/130775249/gatinosapil-ladepinijum-siruwenibuvu-ludesakevozevu.pdfIn PDF document text
    • http://files.themixyouthcooperative.com/uploads/1/3/1/3/131383045/niwetu-burun-temosofo.pdfIn PDF document text
    • http://nixop.moriahellamason.com/uploads/1/3/1/6/131636612/b3b188cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/partitura_vals_de_amelie_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/72441827979.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4828/6880/files/56101899774.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6204/8421/files/52151318974.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2191/0687/files/11772386029.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3797/4950/files/23842849195.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4603/4846/files/zomegopuvegotasiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/inventions_of_the_industrial_revolution_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4610/9345/files/3710972151.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/23910425321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/6285/1749/files/surface_area_of_cube_and_rectangular_prism_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5253/1869/files/17949356622.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16485275060.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_off0000676f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x676F 5408 bytes
SHA-256: 5dd4f833c40a9a82918de140d5ec9851501dcc073f5f909aee8140291c80c249
font_01_sfnt_off000079a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79A3 10412 bytes
SHA-256: dde2b949b65a179dd95c79ac6149eb3c9e45d50e3a4ae343270115aad5624c9c

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