Malicious PDF — malware analysis report

Static analysis result for SHA-256 171466c4d8cc21c6…

MALICIOUS

PDF

73.5 KB Created: 2020-11-07 20:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a648bf1baf0e1c3360f3c0447c74e4bd SHA-1: d4712d40ebda65e1fa884b3a170b50bcce95ebf5 SHA-256: 171466c4d8cc21c6fe0ae1bfc0ff478c3fb3c8838ba816db1ab79bbafd95311c
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, characteristic of a link farm, with one URL identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the link farm behavior suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

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/123?keyword=a+snow+leopards+enemies In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wegemebufojafak/bloodvine_set_classic_wow_mats.pdfIn PDF document text
    • https://rozivulafili.files.wordpress.com/2020/11/46705465642.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/ph_worksheet_key_editable.pdfIn PDF document text
    • https://fepefik.files.wordpress.com/2020/11/dusufegazebineve.pdfIn PDF document text
    • https://jasafoxena.files.wordpress.com/2020/11/nokusot.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/sexupiveletagi.pdfIn PDF document text
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/81832906903.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/agric_economics_textbook.pdfIn PDF document text
    • https://noxikadaguva.files.wordpress.com/2020/11/dodulanuxopilekuwuju.pdfIn PDF document text
    • https://ruxudaverotu.files.wordpress.com/2020/11/tinalam.pdfIn PDF document text
    • https://ziruvetod.files.wordpress.com/2020/11/nutelajorazodenaladulaji.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_off0000df5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5B 5188 bytes
SHA-256: 67a64662104d7e451522dca1135addbd9b1a6d69204246ecde9795d55d5a0809
font_01_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 11892 bytes
SHA-256: fe2c90d22f4512bf6ccf00da4cbba52f8f9d8c844c6017674e4437847a5a12f8

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