Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f33f7a9b417973e…

MALICIOUS

PDF

52.3 KB Created: 2020-11-03 13:19:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 82348a2f50f9474937f956d23e149e68 SHA-1: c4e733cb14da698ec5d37289e9e70d627220b2dd SHA-256: 8f33f7a9b417973e1ef2e0fb8e4a1e06dc1b4d22c23ff011387a3690d1cfceb0
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a redirector link to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that matches one of the identified malicious links. The presence of multiple PDF links suggests an attempt to create a link farm for SEO manipulation or to distribute further malicious content.

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=ib+ee+guide+anthropology+rubric In PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/fazuvide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5f87a6118439d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5f9f3a9e0e4c1.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/rowapa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417997/normal_5f96d24369206.pdfIn PDF document text
    • https://ruwotepileta.weebly.com/uploads/1/3/4/4/134493455/zozipax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f88db28d8888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8c25818a0ac.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/ba0d6ed99a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_5f93cc2db2a4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5f93c46323d3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f872a6ea1b23.pdfIn PDF document text
    • https://sadutixonigonu.weebly.com/uploads/1/3/1/4/131412491/nusugibavifon-zixunesaxu-gaxudupigigon-wonelanudud.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/1/0440/0676/8798/files/network_stumbler_para_android.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_off00008d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D3F 5336 bytes
SHA-256: 8dc7a5b514762e67e025401852864c11f9a9927f0445d9df5810cc4e95a9fd5b
font_01_sfnt_off00009f67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F67 10720 bytes
SHA-256: 58e19e028711fb2c00c500939539a90323b806d42abb93a0d5f1057bd06d7c5a

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