Malicious PDF — malware analysis report

Static analysis result for SHA-256 b855482ca500de41…

MALICIOUS

PDF

46.6 KB Created: 2020-10-10 20:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 2b17737f8fdddeaf048b6ba6552b67b8 SHA-1: 295fa64a680887963e2975ae38f13d3a5d2b994c SHA-256: b855482ca500de41c82445e223fe0240c5e6a7a97990e53d776aba4f587f4cde
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/strik?keyword=light+wind+and+dreams+pdf In PDF document text
    • https://site-1038601.mozfiles.com/files/1038601/bofagafineno.pdfIn PDF document text
    • https://site-1038495.mozfiles.com/files/1038495/39426356603.pdfIn PDF document text
    • https://site-1042889.mozfiles.com/files/1042889/49733511021.pdfIn PDF document text
    • https://site-1043203.mozfiles.com/files/1043203/28447060540.pdfIn PDF document text
    • http://medafufis.pegdownracing.com/uploads/1/3/1/3/131398140/1931846.pdfIn PDF document text
    • http://files.arcticaircaribbean.com/uploads/1/3/1/8/131856949/409a1d09d3d52b.pdfIn PDF document text
    • http://files.jereminsng.com/uploads/1/3/1/4/131438823/sufugo_tagefoziv_xalenofogat_nomiz.pdfIn PDF document text
    • http://tilofise.jbbarnettmusic.com/uploads/1/3/1/4/131408516/259672f446.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://uploads.strikinglycdn.com/files/1b6536f2-bd20-444f-bf56-d87ee0a73719/76612997754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcc74670-9748-49a1-a799-746293701412/58069837632.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0416/6050/files/508179842.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0249/6677/files/annie_allen_by_gwendolyn_brooks.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/6445/5079/files/82916660469.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5044/8549/files/xelarinuripej.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_off00006967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6967 5132 bytes
SHA-256: d99f68a299b2993b66983a74a6cdea2e7e2beb18cfcd24c05e0986b62e76ce0e
font_01_sfnt_off00007ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AB8 10676 bytes
SHA-256: ac8adbf6a58170729898d5aee1a92f89f8de0b2d5d5a2a1b012583bed42b58e1
font_02_sfnt_off00009f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F46 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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