Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe558b21642fa7bf…

MALICIOUS

PDF

45.3 KB Created: 2020-10-26 12:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-26
MD5: 412899da88bdc5bd1eec5027547f3837 SHA-1: 4249d020b3b7ef9e8772254b35996600101daf3c SHA-256: fe558b21642fa7bfde96ea8d5b1e74eb7bc1c72b0ca710633334f480a1e2b5cc
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=pdf+file+to+wordpad+converter+online In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367273/normal_5f8b85421b3ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378856/normal_5f8bf53178f61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369317/normal_5f8f6786aecff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f8e4397f2965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_5f90bb952bc7c.pdfIn PDF document text
    • https://nobinetezo.weebly.com/uploads/1/3/0/9/130969761/gejaxuruxil.pdfIn PDF document text
    • https://mozeduxazos.weebly.com/uploads/1/3/4/0/134018133/majogenupej_xisojirobukudo_rugaji_dipode.pdfIn PDF document text
    • https://nogomikosisodop.weebly.com/uploads/1/3/2/6/132681488/2306456.pdfIn PDF document text
    • https://lakupemeza.weebly.com/uploads/1/3/4/2/134235705/2858496.pdfIn PDF document text
    • https://dokakida.weebly.com/uploads/1/3/1/3/131380589/xutaxesux.pdfIn PDF document text
    • http://www.ascendercorp.com/In extracted file (font_00_sfnt_off00007181.bin)
    • http://www.ascendercorp.com/typedesigners.htmlIn extracted file (font_00_sfnt_off00007181.bin)
    • https://uploads.strikinglycdn.com/files/9ac1b9ac-7ae8-461c-b091-576a3c2d8682/fexonirune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8d8e18-c3bd-493a-a844-05d08c8ea8b8/80069492434.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a048c46-d0fb-4f3c-92ba-9d24faef075a/dajubinuvunijepuxexojobaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/0137/5650/files/sufadoruzugefutotej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7305/1042/files/limijuno.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9536/2209/files/zifowiwiduvuxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2992/4520/files/unblocked_games_by_dylan_minecraft.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/1035/7913/files/calendario_2020_para_imprimir_anual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6479/9644/files/adding_and_subtracting_fractions_questions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/8916/9046/files/68343204982.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/7481/7693/files/jiluwilarikawijad.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_off00007181.bin)

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7181 5124 bytes
SHA-256: c8dcf604a960a89135b24c3707209c50e28e89a5ebe4e252683788521a2df0bf
font_01_sfnt_off00008313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 10660 bytes
SHA-256: a580bcd60769af1cc390d915ce0f8ef26fc74397e43e53749476b59fbd3b483f