Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a93dfa3100882b1…

MALICIOUS

PDF

42.2 KB Created: 2020-10-04 06:43:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 68b451c2c7b399bf8248a88eed4d1da4 SHA-1: 687050c89d7178a4e63de19f152bb6faccb7bf1f SHA-256: 9a93dfa3100882b14ca6a4f3c995dea1c9805dfe0ff1073a74aeef24f616419e
124 Risk Score

Malware Insights

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

This PDF document contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms that at least one of these URLs leads to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body itself appears to be obfuscated or corrupted, but the presence of multiple links suggests an attempt to lure users to external malicious sites.

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/pify?keyword=to+kill+a+mockingbird+tests+and+answers In PDF document text
    • http://wukugigam.inpoweryoga.com/uploads/1/3/1/8/131857590/berokixaleteguv-wogoziliron-xajulola-dimanerakifurod.pdfIn PDF document text
    • http://fizutire.affectedfilms.com/uploads/1/3/0/7/130739922/rizepixowuvewago.pdfIn PDF document text
    • http://jidug.patrickmorriseyunlawfulacts.com/uploads/1/3/1/3/131383434/tivezinixi.pdfIn PDF document text
    • http://files.westside-church.com/uploads/1/3/1/4/131436956/welekamazoro_sudifizuvivav_gonosofazeku.pdfIn PDF document text
    • https://site-1037870.mozfiles.com/files/1037870/vikijazunelomiga.pdfIn PDF document text
    • https://site-1036640.mozfiles.com/files/1036640/batoxutamipedegele.pdfIn PDF document text
    • https://site-1038312.mozfiles.com/files/1038312/33820530375.pdfIn PDF document text
    • https://site-1040238.mozfiles.com/files/1040238/30848095556.pdfIn PDF document text
    • https://site-1037241.mozfiles.com/files/1037241/nasoz.pdfIn PDF document text
    • https://site-1037884.mozfiles.com/files/1037884/zipikigigavawi.pdfIn PDF document text
    • https://site-1037033.mozfiles.com/files/1037033/60472657829.pdfIn PDF document text
    • https://site-1036945.mozfiles.com/files/1036945/27970161703.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/89653701786.pdfIn PDF document text
    • https://site-1039188.mozfiles.com/files/1039188/27425988745.pdfIn PDF document text
    • https://site-1040263.mozfiles.com/files/1040263/45538504504.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000066a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66A9 5504 bytes
SHA-256: 7c73723b9a8a4b072f9af13d2822b50bbc1a5ff12dad1983f859d44926d96dc6
font_01_sfnt_off00007957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7957 10120 bytes
SHA-256: e4655c66a7d1c3ecb7f15796879e05a6240b8d24b5810fb1d63f4382003a257d

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