Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f441f486b6721eb…

MALICIOUS

PDF

46.8 KB Created: 2020-10-30 15:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c2199586e279b17157711a686f2e8178 SHA-1: bb9d192fc29fc335e132441aa3774c30066e8f16 SHA-256: 5f441f486b6721eb3827172c0728f9db1220725ea56d47d52d89af05e6fdf8b1
94 Risk Score

Malware Insights

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

The PDF contains a malicious link that redirects to the URL https://cctraff.ru/aws?keyword=english+to+indonesian+translator+job. This URL is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL, suggesting an attempt to trick the user into visiting a malicious site. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/aws?keyword=english+to+indonesian+translator+job In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f9467f746ecd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381101/normal_5f97f97fb14c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382789/normal_5f90bb339be23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5f94c2d589cc5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402938/normal_5f9b8062e2dca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388627/normal_5f8ef46e63d96.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/e8ea140b-e1fa-42c3-9949-78046197ce8c/38810703641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6391c350-4fbd-4eee-9e5c-71e2f985913c/sibiwelerutanilakuwudu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7f7621-7463-494c-9853-9a792113ab66/xemazolevedibipejavese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d32b1c83-d400-46d9-97c9-d9d11078ad10/nebujofarufonilutitalujuk.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/printable_calendar_may_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a101e4b-3e85-4329-b34e-4ee35f561538/wamikobifudu.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/81131461710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27d0cef6-083f-4039-8ebf-d431a2146955/90395323941.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_off0000790b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790B 5260 bytes
SHA-256: 3ed95d4836be6ba27570700acf511a720292fdce574ceb4dcdf17bf24492d530
font_01_sfnt_off00008aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AEA 10460 bytes
SHA-256: 5603089ecb9e37c74ad2dfe27c043bd2ef4b0273e14da59bfb73b29808bfd9b3

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