Malicious PDF — malware analysis report

Static analysis result for SHA-256 0af228edd3c86525…

MALICIOUS

PDF

45.6 KB Created: 2020-11-04 07:33:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 14c8066cff35b0c9651e23f3cf91dee1 SHA-1: da2ef22089bc2befa7281ef206c2dceda36021ab SHA-256: 0af228edd3c86525786130263daa8b0b30482feb28f4c9f5f728f2058e70a66c
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/wirul.pdf.
  • 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.ru/123?keyword=are+same+side+interior+angles+ever+congruent In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_5f9ad936f3da1.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/wirul.pdfIn PDF document text
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/ed9112.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/guwutivupudutu/fufabosu.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/download_acrobat_reader_free_full_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacec513-dc57-47d7-b9b2-0a01d4058948/wevejovumarasedibeli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c9126ba-3de5-4f40-bdaf-c04eba6265c8/bonhoeffer_the_cost_of_discipleship.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/bridgman_gauge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c6e41b6-4d6e-4b85-8390-46600ff27a7f/1040754977.pdfIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/english_vocab_list_dan_artinya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fedd95dd-1c97-43b3-8731-f64264576993/34103155459.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x52F5 5308 bytes
SHA-256: 684854af49c0761e4c989288b925e5464bbbcdc48f079ea9f475e211a47541f8
font_01_sfnt_off000064f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 14796 bytes
SHA-256: 35d14d18b9449160e9845358aa910a6682956d3930a8f3c3ad41608be7f29c2a
font_02_sfnt_off000093ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93EC 16244 bytes
SHA-256: 29129b6cd47f3def73d41e43b993ec124b59e2b85bd4edca9f3108fcdecce04e

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