Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e098ab187df9a83…

MALICIOUS

PDF

35.8 KB Created: 2020-10-17 13:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 63850d1967235a2b7694b8f4cf590295 SHA-1: 9b1cccf743d6d36b980ad5e350598fc0670a53f1 SHA-256: 4e098ab187df9a83fcdfeb55cb9963a947484f85edbc6902ecf827de62132156
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/123?keyword=biological+molecules+exam+questions+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f86f4cf17f24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372073/normal_5f8a85b99c268.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367281/normal_5f874ff18f309.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f86fe924bd61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f87401131dec.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/1/0438/4397/7366/files/99401346472.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3228/9175/files/fukemapanonagobajafas.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3325/8915/files/30_times_table_grid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6050/1921/files/teks_pembukaan_uud_1945_untuk_upacara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7432/9507/files/xidiwafexufope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2b8cc6-e0cf-415d-9fed-6c7e0c68d42d/31784044936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec659130-d5ff-4e89-b5ae-b696237fc628/davizalepawanuxibawimeb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bea23b7d-6967-4baa-88b0-5f2c9e686ff3/dazagosel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6988/5601/files/obinutuzumab_package_insert.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3046/3135/files/xowifosisarobowawigekumo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/cafeteria_nipponica_apk_mod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2900/7002/files/zipusamuritudoximilegope.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fefe6ec-80e2-4f9e-82ec-45fc4cbe61c8/lufifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c53b6bf9-75a0-47bf-aa93-606c754e6e45/58232909111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/521d4241-954c-43c5-9292-ecbf049236fd/tematudunomodago.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f50079a-f7bf-44eb-aee2-7d6787d41159/mazegazumafunewifek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ebaddbf-b5d4-4527-b076-1f445d4d061c/budedokitobifivul.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_off00004e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E2F 5620 bytes
SHA-256: 7b8a264b2b7dbfdf5f1cca707016941200ff3564319e5a34ab96c568c3c7fa84
font_01_sfnt_off0000613f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x613F 9604 bytes
SHA-256: 98c95ec885127c463e5d861a36287479f7f4ccf7d284fcd043431b8db765dc3c

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