Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef8be19a3ff9b636…

MALICIOUS

PDF

48.5 KB Created: 2020-10-27 20:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: c8cf1bbd873d5687d264fd9117bbe7d5 SHA-1: 0e2b65cc9b31f325ca910aef04bdb7f799f105d9 SHA-256: ef8be19a3ff9b63664f3ccd3885785a11dd154f305c8af487c71cd89dd60205b
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.me/123?keyword=paypal+status+money+received+pending In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_5f8e58b694ebc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5f8b4b56ef984.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393349/normal_5f901654c04fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5f8dc17da474f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408483/normal_5f971c64a7677.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/2b569e50-1c9b-4098-a3b4-e2bc39d4f8a3/97484647210.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e85880d0-5731-479b-8f55-82198b8e0b29/76272506780.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29ca6468-d5c1-4388-8d4e-b4e639b90509/71396709243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54d104ca-6fa0-4171-9f91-b6260f680695/mesigijuzipudukeveduwejum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cf6c637-1a9e-4be2-b5e1-7c36ae0f7d37/49110209285.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a123aff8-edb7-4776-99b8-9fe05d6574c9/ejemplos_de_sociogramas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57d9236d-8dc9-42df-a9dc-9191fd61a150/osha_10_general_industry_final_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79669a72-646e-4d1c-902c-92cc46cbe47c/xawomubado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/2393/9753/files/poiseuilles_equation_derivation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0623/2229/files/10196745859.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c693d5de-e34b-4f34-866e-2edd958e054a/47849245762.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/485d2667-b700-45fb-af41-876642d49d47/potobosesepalezewixakaseg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad7bee3-9f17-40f7-80ec-2f34f069a969/16171843319.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00006e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4B 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00007e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3F 5556 bytes
SHA-256: 065c0324525bf197f6d43ab24746ce7d9b6c4fcb3fdb6b834a42c223147954f1
font_02_sfnt_off00009115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9115 10348 bytes
SHA-256: 937b2f8950a0add77c6323fcff165da78711cf160a40a0189fd5001ed94c53ba

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