Malicious PDF — malware analysis report

Static analysis result for SHA-256 f88b6585d89cda11…

MALICIOUS

PDF

44.8 KB Created: 2020-08-05 17:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 6528247a06a1db833c2b2f49e1431039 SHA-1: 661b0fd9abefced1f3afcc0c03276f7bcf8b0998 SHA-256: f88b6585d89cda111a414fcee9f47feca9cd798c6b1a0f4af165481777c33c9d
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.com/pify?keyword=apes+review+book+pdf In PDF document text
    • http://files.wisdellshomes.com/uploads/1/3/1/3/131379615/xifusago.pdfIn PDF document text
    • http://files.adelaidechickensittingservice.com/uploads/1/3/1/8/131857071/wovakemeluwo-bokevanukapaku.pdfIn PDF document text
    • http://files.synergisticstemoutreachcenter.org/uploads/1/3/2/8/132815002/fivarewenim-vomojem-galijutosujer.pdfIn PDF document text
    • http://xewolol.loridanenberg.com/uploads/1/3/2/3/132303189/be38b143.pdfIn PDF document text
    • http://files.andredequadros.com/uploads/1/3/1/6/131606874/699e4.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/1/0433/6310/6968/files/39542739296.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7876/9045/files/read_books_online_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0304/2216/files/automobile_safety_system.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5863/3631/files/36586625305.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/bebikatimed.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8417/5773/files/another_in_the_fire_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/adenosina_ampola_bula.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4864/8354/files/bevepebolekowe.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_off000071e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71E9 5136 bytes
SHA-256: 123a97735d1935fede4b5c9b95ae5740c307f45c43687d25e965e67b0b61a682
font_01_sfnt_off00008383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8383 10440 bytes
SHA-256: 4fcf38d8d9f3aa088fbf46a57f9a504ba32cc35563af109c3341e0fa73b4c9dc

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