Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bbc23aa43eb8129…

MALICIOUS

PDF

59.0 KB Created: 2020-10-01 18:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 0ed74e9a213ea9cd49b4039887e7d9ef SHA-1: 77d003a216336a0a7b78cc8d47720bd329c771a5 SHA-256: 5bbc23aa43eb8129282a22ecf48f4d28524142273b52ad98cbc3d897c645895d
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=critical+thinking+skills+for+dummies+pdf+free+download In PDF document text
    • http://files.nmffa.org/uploads/1/3/0/9/130969819/deniz.pdfIn PDF document text
    • http://files.matthewcampbelljewelry.com/uploads/1/3/0/7/130776779/71d0a0ba661.pdfIn PDF document text
    • http://files.mariedilorenzo.com/uploads/1/3/1/1/131164016/e573dc8de38.pdfIn PDF document text
    • http://files.creativitycards.net/uploads/1/3/2/6/132681482/fcce0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5dbb2bd0-8a3a-49e0-acbc-758cb60c8d68/76978516141.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d458bdc-665f-4b76-9791-f5f50b13d25c/31041996243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8478e6b7-4cc0-4aa8-880d-c1049f4a96bd/bejesegebaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26798ca0-6806-48f9-880e-4f766529bceb/96128457849.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec9ee973-6c56-4715-b907-a9c6eaf6847f/17495283063.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66639329-b581-4b47-8591-78265d48a62a/nodenoluwobafupurune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0876a074-4fc3-4858-982d-1aa6760efefb/59265814140.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6087/4401/files/oriental_theater_milwaukee_history.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9749/8535/files/87441469332.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/dulexinejase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/5956/8791/files/world_history_patterns_of_interactions_textbook.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/5648/2472/files/4.5_aquatic_ecosystems_answers.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_off0000a90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA90D 5632 bytes
SHA-256: 082b52ee4b5851b4fe1d7a57e0c0f64b2d788ba4ef0b33971da034a4ed58aa8b
font_01_sfnt_off0000bc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC16 10028 bytes
SHA-256: 40679e0ccc0faa33ec5a240ecb02786e285136aa0a52f5b8603df2487f055500

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