Malicious PDF — malware analysis report

Static analysis result for SHA-256 0871204057d8b965…

MALICIOUS

PDF

38.9 KB Created: 2020-08-14 16:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 1fb0acb5dccac5ba5fa5787056e737c0 SHA-1: 215eedc874c15395a9471703710e5ee65466f912 SHA-256: 0871204057d8b965b64075693b0faa10684c852b7cd3521a4cd29120e2da6b16
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=letter+of+recommendation+for+former+employee+template In PDF document text
    • http://files.susdorchestras.com/uploads/1/3/2/6/132696506/26ee18b574.pdfIn PDF document text
    • http://solosodi.moodypig.com/uploads/1/3/0/8/130813765/damuguwamop_vugujubam.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/1/0433/0687/7080/files/61238086127.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4586/1014/files/romimogawopawopuxuta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9172/9309/files/imposters_handbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/zirilorusomirefigovuvedo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2328/5928/files/29773465823.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/zefemevere.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1315/0632/files/caparo_industries_plc_v_dickman.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/3831/9527/files/42567522863.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4809/2327/files/zurenidirudoxupana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7265/1413/files/fafovomanivonopa.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_off00005cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBB 5164 bytes
SHA-256: 3d84ceaff9af1e6fe439bab4e859a85bfa83b94ff58c8896072fe2fe57c5f9b4
font_01_sfnt_off00006e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E39 9520 bytes
SHA-256: db261f5f03819934cc58769acff07ab3283fff157f17213eed8ebe167f887f23

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