Malicious PDF — malware analysis report

Static analysis result for SHA-256 afadf66e91000c4f…

MALICIOUS

PDF

57.1 KB Created: 2020-10-25 19:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: fc4e8e15cd4e34ea21872339821a76f2 SHA-1: 98c1b7bf5696b7099039b58f92038e1d128495aa SHA-256: afadf66e91000c4fd1bbbca8c49ed483fe34dd72366a0aebd4c0402d96bfca68
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/aws?keyword=history+of+crime+fiction+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f8fdcce11a5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366041/normal_5f8727169f210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_5f8e5ea749c85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371003/normal_5f8d7b30f1a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380867/normal_5f9108fcba9b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f92d486b2076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f9192e7cff18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5f8b1656218b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412905/normal_5f952260d8d3b.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/8d046921-b1c9-4fb7-a872-5ef6f759f7c2/mupagotapaturawezisil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3c0f79e-d243-4a34-97ff-0a101d6eda3e/92130305147.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e3fdb2-ac5a-49e1-afc0-6eb09a70f26a/guvewaratomuful.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/375251dd-c78a-4495-89f5-3b98c4d0fd4f/8001255562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f98d16ab-aace-4f49-bbdd-20983013a5e8/xenosovowotumowuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d08ecb4-307c-4d47-939d-4ce1fb352370/xasagojaletuwifax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a7972de-75f4-473f-8f78-921400f787c5/73873283536.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/38093618279.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/66075901477.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/gewigipodanoferobesu.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/child_growth_and_development_stages.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/junegusifejugabil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6093/1991/files/33333774505.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/broadworks_call_center_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/7910/2378/files/traditional_theories_of_intelligence.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/0601/1803/files/define_joint_stock_company.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/3509/3911/files/pricipios_de_cirugia_odontologia.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_off00009dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9DD1 5124 bytes
SHA-256: 24ad71dfd0acdb374246891d6a0e6b41368d8a132946241d7d1d53c585f78306
font_01_sfnt_off0000af2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF2B 12084 bytes
SHA-256: 9784c6d1ab8333865c46b31dd31204579f1579b0f69b525bb52668cf6e6b6472

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