Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a3a0c62ba4d633…

MALICIOUS

PDF

40.2 KB Created: 2020-10-15 10:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1d41f98ce2ba67f9f7792644e9965936 SHA-1: 76a02fd1ba300ef8511b70c2ff6b6231a339a7d8 SHA-256: 78a3a0c62ba4d633b0ded568d44aa980c28b3cfe4617ce2150bb18dab634d29a
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/pify?keyword=arcsin+arccos+arctan+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365594/normal_5f874619d03a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368989/normal_5f87b1f71ce93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f874e03a24f1.pdfIn PDF document text
    • https://site-1039496.mozfiles.com/files/1039496/getipokubiwa.pdfIn PDF document text
    • https://site-1043666.mozfiles.com/files/1043666/filukenoxelop.pdfIn PDF document text
    • https://site-1036621.mozfiles.com/files/1036621/89511686113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f87131f8804f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365607/normal_5f87245e05f2a.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/c2bf2d86-e4be-4dca-a604-7e506c0eff39/80312486241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38b606e3-d7b2-46eb-8acc-e7c3ce9f7f9b/serebimixere.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f10fd676-c077-42e1-b415-d5e5e8ae1edb/xaferejokelaxepab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fbf933-9e8b-418a-9723-b8fe91d66e6f/21829410362.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1290/5370/files/bethany_hamilton_book.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4474/9731/files/apush_2017_study_guide_period_3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8331/7926/files/18960709898.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bea171-81da-4089-b5d7-00ab86dc0c09/8824777464.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47196518-a5ac-4d49-997f-762db16995ad/60767142839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0177790e-c7a3-453f-ba44-e90f3b7871bd/68383302777.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_off00005388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5388 5000 bytes
SHA-256: 08545020e64c30da1ee800d9ea0e3da6c9e7b57997ff837ec6d40e2abb0a61db
font_01_sfnt_off0000648a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x648A 15036 bytes
SHA-256: 78d011fa0868aba8d50448358c4ea669eb74a769e9e20486378b05772d509cd5

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