Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7bf9d4447904d79…

MALICIOUS

PDF

52.0 KB Created: 2020-10-21 16:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-25
MD5: 99ef0ac7b7d7caf0058d9b0ad773c073 SHA-1: acc28a750341ea0462815845d5acc4d89c54c514 SHA-256: e7bf9d4447904d79259427bdce8231b15b94409360fb6d876bad6c0208429b25
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/aws?keyword=acidoc%25C3%25A9tose+diab%25C3%25A9tique+pdf+2018 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_5f8fae7292bfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_5f8af5254eb86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f872ebfdade4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370304/normal_5f8b614bc12e5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_5f894269b01ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_5f8f6618d3a77.pdfIn PDF document text
    • https://jikeberu.weebly.com/uploads/1/3/1/8/131857846/pererasunob_bixawuzapag_latikopu.pdfIn PDF document text
    • https://bilewobadazape.weebly.com/uploads/1/3/2/6/132695578/2682796.pdfIn PDF document text
    • https://xilorufanil.weebly.com/uploads/1/3/0/7/130739938/konewi.pdfIn PDF document text
    • https://latenenagizogip.weebly.com/uploads/1/3/2/6/132696064/8136917.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/9051401.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/1/0484/9929/4363/files/citrix_receiver_android_app.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/6424/8470/files/cyberpower_ups_825va_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/4355/0910/files/certidumbre_riesgo_e_incertidumbre.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7667/1895/files/how_to_read_oil_dipstick_honda_crv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/7088/4514/files/everymans_talmud_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a42e7d3-551b-4d47-bc4b-360db0e12138/dezidetirapokopumud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11f501c3-9105-4cca-a67b-f969301440bd/7290552118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19503c91-52d2-4dd9-8a1c-68833707d17e/78892280136.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da3c19a9-0842-4301-9cfc-e3719edbcb01/25497127905.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49859692-00fc-4925-be3c-ac5fa10719ac/riluxo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB4 5712 bytes
SHA-256: 65ea39930ac2294ef1d3f499b9118a3576fed364a950122ab82df315330f2b5b
font_01_sfnt_off000082e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82E5 15780 bytes
SHA-256: 856cf36037c41995d6f8a9174605c8ca8e62c08560339383225b437bd5373819
font_02_sfnt_off0000b27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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