Malicious PDF — malware analysis report

Static analysis result for SHA-256 41a59656523317d2…

MALICIOUS

PDF

71.8 KB Created: 2020-10-29 23:42:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 986536fa466493cb46cfb5b685d2606f SHA-1: e741f3ad085284290179b6e8d609ed52802a42b7 SHA-256: 41a59656523317d2bf4dbe28388f7806b79f2f1acef7f1e727915debc4e85266
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=osrs+30+def+pure+guide In PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/xaxuligixud-kesase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5f93b8e95c4e4.pdfIn PDF document text
    • https://zasiranel.weebly.com/uploads/1/3/4/5/134507270/7087715.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/78292.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407066/normal_5f91ffaac5ee2.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/7bd5b5f6-5012-4da2-8fde-a8f2dfc83629/47150409562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bd7fcb7-91f5-48bb-b016-0104e0d8dff6/radio_shack_33-280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e02f0f99-0565-4993-a9c4-3f27afe3dc9d/somewhere_in_time_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/free_weekly_behavior_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/568226bf-c18f-4ea7-a74b-c6127ed751b7/gudebijum.pdfIn PDF document text
    • https://s3.amazonaws.com/muvunekagok/d_answer_book_kumon.pdfIn PDF document text
    • https://s3.amazonaws.com/bunobu/vemupawububerarisole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/0432/1695/files/ias_36_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/501dbb20-f1f6-4dbc-adc4-3ad76fefb940/76397367474.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_off0000daa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA4 5300 bytes
SHA-256: 985aaec4b6bbb7e15f11af51caeeb59ecb2353ba6bf2c45e64b2d55306308f94
font_01_sfnt_off0000ecbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBF 11044 bytes
SHA-256: b94588039a8d4a55a9a13a787f17261c4255a8ef8037cc6df421cea198180651

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