Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d61f0efd9190bf…

MALICIOUS

PDF

41.9 KB Created: 2020-10-04 20:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 22d89270d80989e2fd69fe9219d66145 SHA-1: f224bd4159cc2598f4bf4472e91579872d8aa960 SHA-256: c8d61f0efd9190bf3889ca2936e38b4563a5cbfc4fef6fe3df40e2987c4decfc
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with one specifically identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL https://ggtraff.ru/strik?keyword=adso+in+bw4hana, which is also listed as a malicious redirector. The numerous links to disposable hosting suggest an attempt to distribute malware or conduct phishing.

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://ggtraff.ru/strik?keyword=adso+in+bw4hana In PDF document text
    • https://site-1041491.mozfiles.com/files/1041491/79541125.pdfIn PDF document text
    • https://site-1040140.mozfiles.com/files/1040140/jopadawife.pdfIn PDF document text
    • https://site-1037048.mozfiles.com/files/1037048/laserofebanilariputeme.pdfIn PDF document text
    • https://site-1040238.mozfiles.com/files/1040238/12275419264.pdfIn PDF document text
    • https://site-1036973.mozfiles.com/files/1036973/47681358292.pdfIn PDF document text
    • https://site-1038779.mozfiles.com/files/1038779/gokadesiwefomenezof.pdfIn PDF document text
    • https://site-1040775.mozfiles.com/files/1040775/pimobekosazusazuwejufere.pdfIn PDF document text
    • http://files.thefancyhedgehog.com/uploads/1/3/0/7/130739593/daduwuwawigino_wodawonarixa_jasotojanupove.pdfIn PDF document text
    • http://files.mrgrenier.com/uploads/1/3/0/7/130738792/tulutu-lamututim.pdfIn PDF document text
    • http://files.sriyantrawatch.com/uploads/1/3/0/9/130969435/xofitesakik.pdfIn PDF document text
    • http://mavikes.danielzurek.com/uploads/1/3/1/4/131437296/7054194.pdfIn PDF document text
    • http://kizaf.indigorainstudio.com/uploads/1/3/0/7/130739579/6983533.pdfIn PDF document text
    • https://site-1036716.mozfiles.com/files/1036716/54271038358.pdfIn PDF document text
    • https://site-1036639.mozfiles.com/files/1036639/vosibeketixoxorizag.pdfIn PDF document text
    • https://site-1037135.mozfiles.com/files/1037135/vedugidedaxub.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/pebuganivi.pdfIn PDF document text
    • https://site-1037189.mozfiles.com/files/1037189/xotirewix.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_off000067af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67AF 5092 bytes
SHA-256: cae84ce0d96ee65686cdbb4ba56364a6a8a6c3f7cc28ea4eae6f4690599f176e
font_01_sfnt_off00007916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7916 10004 bytes
SHA-256: c863de0c502d2091865863456d35d214b47f45d182c37a69c119efaf784c24f8

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