Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4965b31ba9678e7…

MALICIOUS

PDF

47.8 KB Created: 2020-10-16 05:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 74fb9b39436165d166c3b90d296ffc79 SHA-1: 54b55dbbb4ea1d94f4e301e1fc1f809fedf06760 SHA-256: b4965b31ba9678e7c7d3966e575975dde423f0ccef3c90225e501f27cf38a6ab
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://gettraff.ru/123?keyword=probability+questions+pdf+for+bank+exams In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/9051060.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/vanojiraxajerubefiza.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/fipugerebenabuxan.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/volupubaxenidiwos.pdfIn PDF document text
    • https://dejuxowiku.weebly.com/uploads/1/3/0/7/130738850/dunisafupusig.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/nukexifepejisox.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/1/0440/2321/8341/files/ford_focus_roof_rack_thule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/5129/4376/files/fsa_algebra_2_eoc_review_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/1954/7036/files/the_22_immutable_laws_of_marketing_drive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f54ceef-2f4a-45c6-975d-2ed6a54642ac/28071564158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d951ee6-6357-4a23-a9cc-809092c4faf9/tomisemuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6453a9ca-274d-4372-b136-263fdaa8f384/maradesikiloturid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d86f4cc4-2121-40a1-a91d-2472ef0ac111/99114581268.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7db2153-5866-467d-a70e-2b12bdf69dd0/mutimazufedexilenofugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7039/7352/files/normal_bedroom_size_in_ghana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/1784/4382/files/rokevateturunij.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_off00007cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBD 5688 bytes
SHA-256: b022c031a7bd6e0ad8d3387ed72d97778628292c94958ddf9c08b593893c2c86
font_01_sfnt_off00008ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF7 9856 bytes
SHA-256: 0b38ceff2eba17279f9802c2288bea6708158db3b36f906ba509b27a75fc6b2a

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