Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b68579334f2732a…

MALICIOUS

PDF

43.0 KB Created: 2020-10-26 11:52:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 58e735cba3f89ab2db5e0ba040fd26ed SHA-1: b18fff6f9646ee296f7ad7dad9b5d8711d386870 SHA-256: 8b68579334f2732acdb233a66a68993e908f8348bfb2a7ea5c5d73afde86c030
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are designed to mimic legitimate documents, creating a link farm. One of these URLs, https://gettraff.ru/strik?keyword=solubility+curves+worksheet+with+answers, is known to lead to malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://gettraff.ru/strik?keyword=solubility+curves+worksheet+with+answers In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377380/normal_5f8ec6602e17a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366344/normal_5f87ebe8e02ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9583/4280/files/worcester_county_registry_of_deeds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7831/2625/files/ratakulamonurili.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2790/4165/files/15778958189.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/1466/2562/files/ebrietas_daughter_of_the_cosmos_lore.pdfIn PDF document text
    • https://s3.amazonaws.com/gifiz/kiloze.pdfIn PDF document text
    • https://s3.amazonaws.com/rebomedug/about_myself_example.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/godogazodaroketesur.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/gusuxokodekedamaruk.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/aprendizajes_clave_preescolar_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/woneduxakubavef.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/demofabojujadamorakibefan.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/quality_control_and_quality_assurance_free_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/bijebikisofapiri.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7805/6619/files/ibm_qradar_deployment_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0273/9866/files/the_pretender_2001_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77754fda-f3a0-487e-baa6-b0d0d7aeac34/58179881608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e600a1db-2ede-41fc-acee-1c491bf38d8c/fuxokigupofokofoxudekiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fb3ba92-b348-4cbf-9c28-e0276fbc2b59/test_bajo_la_lluvia_interpretacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df879256-c135-4453-bec8-fc420de687fc/jetezibokuwunufod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4dacd4-f658-4152-942c-2d33aacc7601/pnce_tercer_grado_maestro.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_off000068a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68A8 5448 bytes
SHA-256: 6c0eedc9b3700e7bf12c2d330fd5d48294a03ae7e0535f9faaee726ee71c796e
font_01_sfnt_off00007b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B39 10552 bytes
SHA-256: e413ed2a48fce2452d41cc9d2be85f488d117340e74f5c6ddfb500543c8c8e57

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