Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cfad069aa1ffac…

MALICIOUS

PDF

48.7 KB Created: 2020-10-25 06:28:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 7158242e18b930b96632d809f7dcb04f SHA-1: d772a8b10b372f9b12a2a097e4f96bcce4e6964d SHA-256: a6cfad069aa1ffacd38cbe9e621e9a50eb6067480db6a204d2541cff0205ea49
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=alcoholism+meaning+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5f8cc5dc41727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391903/normal_5f94f1103f963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5f875b022a809.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375716/normal_5f9291b300355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_5f94edc5a01b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387939/normal_5f93c28c7215a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f9177dc13e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f94da377e1c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374703/normal_5f8e7b897342b.pdfIn PDF document text
    • https://xukanimuwuvam.weebly.com/uploads/1/3/2/6/132696198/2327983.pdfIn PDF document text
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/ee9685698f5e92.pdfIn PDF document text
    • https://kamijiruwidezi.weebly.com/uploads/1/3/4/3/134387945/zijemowilix.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007dc7.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007dc7.bin)
    • https://s3.amazonaws.com/wiwamoxamo/unalienable_rights.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/dumbbell_exercises_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/nigedexiraripusoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ef24310-8b31-4541-8b43-65341346bf85/dixolitaxopa.pdfIn PDF document text
    • https://s3.amazonaws.com/mibiwivanetuj/alto_sax_christmas_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/logically_fallacious_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/59788050400.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/69211574540.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/free_aptitude_test_with_answers.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 extracted file (font_00_sfnt_off00007dc7.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC7 5464 bytes
SHA-256: 3ebd99c5ae3aa9790c65cbd4f4dd62ca1b57b897eb519ba071d26f6630f11391
font_01_sfnt_off00009039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9039 11088 bytes
SHA-256: 98211b1c09ce3ded20b65dfd685aa2a068263eced5ad1dfd50c7e3da30edf161