Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a0c6e4fcd29dad6…

MALICIOUS

PDF

42.8 KB Created: 2020-10-01 07:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 32ee9433024efbce378b9122b57ffe1f SHA-1: e6c3781a84bebd844f1d888ff91e0f7a185bdfa7 SHA-256: 9a0c6e4fcd29dad6ef5ad298e2cdb332c6543990a8907fe046223ffb32f7e4fc
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links designed to appear as academic resources, but the heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates these lead to known malicious infrastructure. The 'PDF_SEO_LINK_FARM' heuristic further suggests a deliberate attempt to create a network of links for malicious purposes. The document body, though heavily obfuscated, contains URLs that align with the findings of the heuristics, reinforcing the conclusion that this file is a malicious redirector.

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/strik?keyword=anti+cancer+journal+pdf In PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/1329875404.pdfIn PDF document text
    • https://site-1036627.mozfiles.com/files/1036627/kurawapatodokowuwapafim.pdfIn PDF document text
    • https://site-1036722.mozfiles.com/files/1036722/bidaxuxulelofununuwunujaj.pdfIn PDF document text
    • http://vadof.middsga.com/uploads/1/3/0/9/130969497/kuzaxagunomodo.pdfIn PDF document text
    • http://files.bloghitoshikawai.com/uploads/1/3/2/6/132682153/6877623.pdfIn PDF document text
    • http://wuwof.gbscambodia.org/uploads/1/3/1/4/131407405/6334944cc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cad01c8-c090-4ba3-89f8-1b8cb6726b72/gutevo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37c2a249-3777-486e-98cd-ac8a9f653e2d/dimifex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0460/2504/8223/files/excel_exercises_for_students_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/6149/5204/files/hematology_report_mpv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/another_word_for_empathy_starting_with_a.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8766/7104/files/21348321726.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_off00006b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B73 5036 bytes
SHA-256: 33c668bd0158ee626a18e7615bec499f545468702b01d2dd1923b1a9c6de4d8a
font_01_sfnt_off00007cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB0 10068 bytes
SHA-256: f02fba371c64a39d1fda715da8ed68a6bd5046ba8e3045a4c595726b96323c1e

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