Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0fd456cef5503a…

MALICIOUS

PDF

45.1 KB Created: 2020-10-18 05:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: e12ea8386c76192874d8150062b95336 SHA-1: 68a95559d05a675530903b218b50a6591a1ab66f SHA-256: bc0fd456cef5503a4023928519b769d354cc11c50cafe4933a54a1529f753746
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=shape+worksheets+for+kindergarten In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366337/normal_5f8b2058a713a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369166/normal_5f8b15f62da56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381976/normal_5f8b845bf1376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365656/normal_5f87709134e42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366034/normal_5f870ac7c32ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f870eaf94c06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_5f8a013442388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375690/normal_5f89757a85758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5f8b8168cd31d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_5f8b79f56f78c.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/90831518-343a-4988-b064-d6d39bfb4daf/papujuvotanatikek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2e674dc-2759-47b4-975e-05da512f456a/bidajowokojelakatizemu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892e4026-c9ce-488e-bc6a-efc996e65849/67973291428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253b5b33-01bc-4a12-9fed-27afe0cf00bd/shadowrun_5e_best_weapons.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/8733/2253/files/balance_scale_worksheets_1st_grade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/4673/0390/files/zozokifasexo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7347/7052/files/86184828204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/609862ab-9451-406f-ba32-0b50ca055a81/25725115452.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/deeabd2e-703f-4b07-aaa8-38db06ea0c0b/musiwezuvivopekesep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22fc0d5a-836a-4fa0-8d08-9a929880d28c/xiwonisurubafawakimamosu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2efcece8-0b73-4c99-8f87-6a04873ebc9c/zidixijufawojepibepapeba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b23084-deb1-417d-b2ad-657bcb21ae8a/tewuruzaba.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_off00007001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7001 5532 bytes
SHA-256: a0ecc5c65b4edf4832c0364ac7210daab6e5ba142c9d6be5ecfb8e9f65ce8b5c
font_01_sfnt_off000082d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82D9 11012 bytes
SHA-256: c7985c4fb5d6068224d00e9520c328bfe985cf3f34f89c29a44874c98e0a96a8

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