Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ae42ce80dbefdd0…

MALICIOUS

PDF

47.2 KB Created: 2020-10-26 22:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: d012a9b68f1cbaf6b0fd025f64b52058 SHA-1: 85c6254fcf6045c5c72bbff4c9b58e7771970b7d SHA-256: 0ae42ce80dbefdd05c24fafa63f9b671eca43af53376f126122ca85a4b3fff15
162 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a malicious redirector link disguised as a download for character information. The ML classifier and heuristics strongly indicate malicious intent, specifically pointing to a redirector and a link farm designed to host numerous PDFs. While no scripts were extracted, the presence of a malicious URL and the PDF structure suggest an attempt to lead the user to harmful content.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?keyword=warriors+into+the+wild+characters In PDF document text
    • https://mijisurux.weebly.com/uploads/1/3/1/0/131070147/9783592.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/789f05655023109.pdfIn PDF document text
    • https://pumowurunumig.weebly.com/uploads/1/3/2/7/132740285/9927455.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/kavitokolezub/79017476667.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/balancing_chemical_equations_and_types_of_reactions.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/blank_sheet_music_treble.pdfIn PDF document text
    • https://s3.amazonaws.com/xezonijida/povanuvozoganibarako.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/wojutatafowevuze.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/85809330846.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/29257153013.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/63081132387.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/language_acquisition_vs_language_learning.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/wuseladomarifapim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/735487bf-b0d1-4c04-84b1-78b8b6ac20ad/mientras_que_por_competir_con_tu_cab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5ae9272-d625-47a8-a36b-53b5ac7f7f30/78214409897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c2e97a8-89df-473c-9e98-49afc143634e/23435640423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fc6b85b-7477-49dc-9d6c-0e3b6f759e2b/97071086852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82691ecb-bb1d-4e9d-843a-f76b898a2088/17767226641.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/0659/8557/files/89939348317.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/1485/6093/files/tujog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/9171/2927/files/66109669767.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_off0000790b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 5132 bytes
SHA-256: 9f633833b3f4e0fbf535091ec78c0fd04e1b735028908656fd28048a42b0d3e5
font_01_sfnt_off00008a8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8A 11112 bytes
SHA-256: e1b0a188a20ad9746b3a71fcab73a1a8c0a0f766b315fe7213a812d93774179a

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