Malicious PDF — malware analysis report

Static analysis result for SHA-256 71834fe5ffe87796…

MALICIOUS

PDF

35.9 KB Created: 2020-10-03 01:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: d5efbba5b0d8746630c98623667e8ba3 SHA-1: a5d100b9e293b8688466e58238e5a130f38edc57 SHA-256: 71834fe5ffe87796e172b132246f2b05264a4db39b05c90fb407f6979961df63
234 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://ggtraff.ru/strik?keyword=new+gucci+mane+download In PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/noterupolad.pdfIn PDF document text
    • https://site-1036932.mozfiles.com/files/1036932/fumexegup.pdfIn PDF document text
    • http://nagujiwe.magnoliatherapyandconsultationservices.com/uploads/1/3/2/7/132712661/sajes-fitigim-wokave.pdfIn PDF document text
    • http://files.fisherlab.org/uploads/1/3/0/8/130814083/jijowupelenalo-jejonew.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/774e172f-991c-4ac2-a873-011f37e1e17a/laninopogezuworupamiwelig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5660f3-2c01-4fed-9b5a-d2685eddceb5/73882696264.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1e6ee1d-9968-4a4b-ba30-424bf52a7fa7/11451383036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72e7dd7f-9cdd-4670-9784-e509ad6ebe92/5418806330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cdeff21-8cea-4b48-aee4-f7b2d1dc8735/29955752492.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5560/3094/files/henri_lefebvre_the_production_of_space.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0468/9975/7218/files/29160355444.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/6251/7909/files/samsung_galaxy_view_18.4_software_update.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/1943/8750/files/23450601606.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7142/9021/files/boxwell_summer_camp.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_off00004e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E88 5044 bytes
SHA-256: 9b1efd00dda5a7a447bb63565ec1624bc6bf60854b9714f4c1583e786e9c99d1
font_01_sfnt_off00005fb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB9 10392 bytes
SHA-256: beb9f8977db4f803584c90dd4c2240c6ff6b75e979ea7339b66cfff9f22a8b07

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