Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a274874cb42770b…

MALICIOUS

PDF

32.5 KB Created: 2020-10-31 22:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a0e9c097e9f962f3cf5cb2556432c238 SHA-1: 93a16eef7962270e1e48299acd38175393155ff4 SHA-256: 2a274874cb42770b020013ad349ef85495c55df96585efef95f2c6ac4df8fa9f
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded links, many of which point to other PDF files, forming a link farm. The primary link directs users to malicious infrastructure at 'https://cctraff.ru/aws?keyword=entre+amis+6th+edition+pdf', indicating a redirection attempt. The ML classifier strongly flagged this sample as malicious, supporting the conclusion that it is part of a malicious redirection scheme.

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://cctraff.ru/aws?keyword=entre+amis+6th+edition+pdf In PDF document text
    • https://titawijuneve.weebly.com/uploads/1/3/4/0/134012454/8098921.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/7077449.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/e177db37.pdfIn PDF document text
    • https://xazojitov.weebly.com/uploads/1/3/1/4/131408465/1865124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378160/normal_5f8be966b0b83.pdfIn PDF document text
    • https://rajaxamakato.weebly.com/uploads/1/3/2/3/132302926/zonifipifene_bofopifebodupar_semafaxoxovesuw_zafudidajol.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/1/0508/0186/8983/files/98305376488.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/zirulipewari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62df1470-6fa5-4cf4-8331-d8a59d130408/4915287261.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7364/1379/files/xopin.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/87845603916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4662/8259/files/isotopes_and_atomic_mass_phet_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8631/3151/files/lokirobudewofevofevebo.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_off000042b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x42B9 5360 bytes
SHA-256: fda1f51352aff7a99b61a1e9c0f95892639db9eccbb1de675158050884b254bc
font_01_sfnt_off000054c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x54C9 9640 bytes
SHA-256: ec53f74a6ec036b2f175b9e74f6c69afb8cce1de665c761ec215ff14378dd893

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