Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4aad4f2883232d4…

MALICIOUS

PDF

46.3 KB Created: 2020-11-02 00:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 20bb007d42370747663b26333f1e5143 SHA-1: e5228ed607114b7cb3c9efb0a8fc7cfb50cf5d51 SHA-256: f4aad4f2883232d429cb18acf4160123c2d1ea6f201bb6999dc5afc6ae6dce34
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to known malicious redirector infrastructure or link farms. The document body, though heavily obfuscated, contains references to a game guide and includes URLs that are likely intended to lead the user to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a redirector link confirms the intent to lead users to harmful sites.

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=zamorak+boss+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386849/normal_5f8fba71928be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_5f8c2d875f74d.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/rezewupiladu-ridumubumip-nutomixutuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369505/normal_5f93797c8f8dc.pdfIn PDF document text
    • https://viwuwobigoku.weebly.com/uploads/1/3/1/3/131378942/besorutufimoja.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/deguwoja.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/7d3707d5d.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/1/0505/7619/5752/files/18233180891.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9130/4343/files/nawavewugasutun.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1968/8865/files/exploring_real_numbers_worksheet_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/5295/5315/files/26598518681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/0608/8111/files/gevafitabosazixobixugug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/4086/5956/files/72665211199.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_off00007513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7513 5276 bytes
SHA-256: 9e80828991724684307ec8b1817a0cb593b4bcb6ffb082d54230921df6fa57ae
font_01_sfnt_off000086ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86EC 11128 bytes
SHA-256: 763c3012413089abd78994dbc5ae317751a7fa5b4298e8fd309246c8904d4a1a

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