Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec00e431c936931…

MALICIOUS

PDF

46.6 KB Created: 2020-10-27 10:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 29552def68ae4fd37260b01f90ed410a SHA-1: 1846004f40d0da2f041ea1607d696a4fb3723510 SHA-256: aec00e431c9369312c16e51924871227a7849a363cd9a5ec41ade9b80aef166e
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of embedded links, many of which point to disposable hosting services, forming a link farm. One of the primary links redirects to a known malicious URL, suggesting an attempt to lure users into malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=uc+health+stadium In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369332/normal_5f92668377d45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421934/normal_5f96cd43b087c.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/3228699.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/041aa.pdfIn PDF document text
    • https://virataxutepubom.weebly.com/uploads/1/3/0/8/130874282/dipomuwix.pdfIn PDF document text
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/bovudefomuleb.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/womuzegetoku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/virisuwifisigividipov.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/academic_word_list_for_ielts_with_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/lanorolowu/antecedentes_de_la_diabetes_en_mexico.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8083/5782/files/mac_android_usb_tethering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7431d0e2-2412-42ad-8e6c-bff885af0741/94390701615.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43cc88d9-4514-460a-a903-5e362d78a1a6/61549271895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c877e509-149a-45cb-b676-5ee5b43ec992/73437677104.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/0061/0983/files/ath_ed_summer_lacrosse.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4972/5351/files/club_penguin_mission_5.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/3272/2599/files/temoxuxovemagenurux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0508/2781/files/davapidupape.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/7750/8541/files/impacts_of_climate_change_on_agriculture.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_off000076cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x76CC 5072 bytes
SHA-256: 39154e7975635bcddb37316ed1fb2a5e198b5f1e7f387d4c94fd97c5903f7998
font_01_sfnt_off000087e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87E7 11196 bytes
SHA-256: 0300b244cfa139af29daf4bf1be9d56e335a6c5bae2f5b9717aa1bf69a80a513

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