Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a58d836d829e281…

MALICIOUS

PDF

41.4 KB Created: 2020-09-29 05:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 4bd12f7eb523dc06093d52474ecec2c0 SHA-1: 61a41d7d2a497b481b82f6c2efee0511e9907f23 SHA-256: 8a58d836d829e2813f134731d815a9772441bf50f193728ee10ad04d2ef19da7
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.me/pify?keyword=pull+up+christmas+tree+walmart In PDF document text
    • http://suxuxeki.3bdesigns1.com/uploads/1/3/1/4/131406717/modixeruwuxo_rozakejewatin.pdfIn PDF document text
    • http://files.djackson02.org/uploads/1/3/2/8/132814974/7868431.pdfIn PDF document text
    • http://xozasupew.acretsi.com/uploads/1/3/0/9/130970009/802763495caa9b.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/1/0435/4329/8207/files/68264433558.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/6207/3246/files/6393752118.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9806/2491/files/13436537245.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4614/2114/files/tch_trang_file_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8684/7905/files/rokejonovowikesu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/9847/6185/files/transformations_of_graphs_of_exponential_functions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0463/0321/5778/files/insanity_fit_test_worksheet.pdfIn PDF document text
    • https://c8f74af0-895f-450f-ba07-e41275ba13f8.filesusr.com/ugd/2eff39_1dfaf99f557d4b5cb276721509e6e3aa.pdf?index=trueIn PDF document text
    • https://811496ba-80fc-4dd9-8673-ef703015f337.filesusr.com/ugd/ced2dc_0b53c05ec2734b9882efaaa90e3048ea.pdf?index=trueIn PDF document text
    • https://aa28da7e-5e29-459b-9455-a4c136ced0fb.filesusr.com/ugd/1ebe14_ecb4bf60fb4e4d2fafaeb06fce3f93b4.pdf?index=trueIn PDF document text
    • https://cb772fa0-fca3-452e-82ac-40a7774c4a76.filesusr.com/ugd/17ce20_75af3c9c4d9d4304a6c6e89072341ca3.pdf?index=trueIn PDF document text
    • https://06f6a8b0-ce45-4a22-84f0-7878c6d0400e.filesusr.com/ugd/756799_ff8e9eefe80b4d0e8e867db88ce05743.pdf?index=trueIn 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_off00006383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6383 5264 bytes
SHA-256: 4cfb7dd794965ea0e26b08989658dd6d912b7858f3ba9a67e31881bfa141ffdf
font_01_sfnt_off00007546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7546 10568 bytes
SHA-256: e2513962787c8566ff5e24b7b4f4c2d010edba7d6929bd2aa41984a15c4f0e47

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