Malicious PDF — malware analysis report

Static analysis result for SHA-256 94900ce1ed719ed0…

MALICIOUS

PDF

35.3 KB Created: 2020-11-04 20:52:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3c69a9bfb25da95da0e215dda722fc7c SHA-1: d5f2b74c54c5e0c672e9ca7b52f1300dc27a4017 SHA-256: 94900ce1ed719ed02f017cf531a2700ac6bafdc1e31cfd48374d54b813115176
124 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Sub zero 650 refrigerator parts manual' and includes the malicious URL, suggesting a lure to trick users into visiting a potentially harmful site. The ML classifier also strongly indicated maliciousness.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=sub+zero+650+refrigerator+parts+manual In PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/terozi-vejitidufe-woveb-malirigamuwedil.pdfIn PDF document text
    • https://mazofowi.weebly.com/uploads/1/3/4/3/134312703/91993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369793/normal_5f9065645fa52.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/gololezetipej_redori_tulivejifor_tudime.pdfIn PDF document text
    • https://gomemetunugup.weebly.com/uploads/1/3/2/7/132712315/xisipa.pdfIn PDF document text
    • https://kizekusoviwo.weebly.com/uploads/1/3/1/4/131453028/a39e9f4322.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413980/normal_5fa21031a15c8.pdfIn PDF document text
    • https://kifelulamexeb.weebly.com/uploads/1/3/4/3/134310841/lekofepulabosuni.pdfIn PDF document text
    • https://duxixujojive.weebly.com/uploads/1/3/0/7/130739103/didigex.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/taruzudov/single_syllable_word.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/programa_escolar_de_mejora_continua.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/618385f1-acf1-4151-9b8d-78ad6d67bd35/57244004214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/342b4c26-1be5-4f2a-be10-59aa8e7f1203/47106748778.pdfIn PDF document text
    • https://s3.amazonaws.com/tonisefoteka/72071391980.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_off00004aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AA5 5932 bytes
SHA-256: 1de8ac0511a6d305505729279641db88c5af63b105c3bcb6f587f15caf331249
font_01_sfnt_off00005ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5ECD 9832 bytes
SHA-256: 29ba64afeeedd2d701c5f33d05ddd3bde2f2e13a8702234582e0390786a1cb13

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