Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9f49678f34139f…

MALICIOUS

PDF

47.4 KB Created: 2020-10-26 10:52:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-03-01
MD5: 0551d74ff322a66152db0930a16a3f3c SHA-1: c69a4617a8cbad048b49edd3a405fd95c5c44b29 SHA-256: 5d9f49678f34139f913f019648154b9a48ec1254ee996b701634df6b200f9440
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.cc/123?keyword=convert+pdf+to+picture+linux In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f8710cc1862f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393638/normal_5f934dd60df9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f93d47be1b7e.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/9e36351e-8ad4-4210-85e4-e4ce90704776/gizijupolo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66de1d58-aa8e-4a07-97ba-d0942c6cfbd7/83617689710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cff2404-fc17-493f-975c-42996feb1654/regression_line_worksheet_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3907308-f619-44db-b6b2-ac051ac1fbe7/microorganismos_en_la_carne.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/understanding_pathophysiology_craft.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/chinese_food_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/luwezarimerefov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef9cafb0-e19c-4c2b-b592-175e3a72698d/nigapovuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15cc173-d314-4556-8a14-3cd3326554a5/5315696317.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/54312431189.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/sukaduvomi.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/91091600574.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/baofeng_uv-_5r_manual_greek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8013/1759/files/lg_akb72915206_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4409/7176/files/pevolomuvodilamedekogeve.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_off00007b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 4792 bytes
SHA-256: 9aa019eaf51874004625827dbf34e7513fb77272532806c27c66e738bcdf6ae3
font_01_sfnt_off00008ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA6 10964 bytes
SHA-256: f3b70db5596e2002a82ead0a8142b438398260d4e5d80990320991a4a0e3fe92

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