Malicious PDF — malware analysis report

Static analysis result for SHA-256 1316650112f42b7e…

MALICIOUS

PDF

44.8 KB Created: 2020-11-03 08:00:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 81d02b75cff41d9fbb5b95a0c75ed66f SHA-1: 04059d21ad19db66eacd4851c9bc46bb69b13b75 SHA-256: 1316650112f42b7e24e60cbdd373191d7f2fba44cdd3bde6678d1db76865d90d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the redirection of users to potentially harmful external websites, likely for phishing or to serve further malware.

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://ggtraff.ru/aws?keyword=kerri+blue+emperor+tetra In PDF document text
    • https://kevugekakizuxo.weebly.com/uploads/1/3/4/4/134481001/wevumuzejovenivate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374968/normal_5fa0cefac9466.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/kekitogur.pdfIn PDF document text
    • https://rogidalot.weebly.com/uploads/1/3/1/6/131636841/2289554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_5f963e90c0853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385620/normal_5f8fadc20a8a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368991/normal_5f88d75ee0687.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/divep_xejavezexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374533/normal_5f8d4c7d18764.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/vuraradaso/habanera_piano.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/black_codes_and_jim_crow_laws.pdfIn PDF document text
    • https://s3.amazonaws.com/lojigevaxive/samsung_remote_bn59_01178w_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tesotiwapax/bubajibuj.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_off00006fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE1 4896 bytes
SHA-256: 09ae1262f9a8afe5dfa46416a1c8f2cc89189d6d02cf0d9b11f2f65b7686ed87
font_01_sfnt_off0000806e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x806E 11480 bytes
SHA-256: 123ec27bf2f69c56b85291456f0d5ebc4836487b216bc1c84faa18453e47c88c

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