Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ccd1ee833b5e9ee…

MALICIOUS

PDF

50.6 KB Created: 2020-11-06 19:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7423312b1156ecba4ba9590910c248bf SHA-1: 1b26faa375ae3ea1a2d3e9daaba61fb89e5ba457 SHA-256: 7ccd1ee833b5e9ee85b53c5f250c8b4d8fdb1470f169af569c58c64496ee821f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, identified as a link farm, with one URL pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to a manual and the malicious URL, suggesting a lure to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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/aws?keyword=intex+hot+tub+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f9b1f05b73d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5f9cf62b60e50.pdfIn PDF document text
    • https://kirebokiva.weebly.com/uploads/1/3/4/6/134634247/5c86065a0e527.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415748/normal_5f966585d14b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383573/normal_5f9ff60025e8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_5f9d1ebeac29f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393514/normal_5fa1757dc7d51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374715/normal_5f8faf3c6d92b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5f98e50cd659e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379241/normal_5f98d20c81da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f8e1e6e4c8e2.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/gosete/cancer_immunotherapy_using_checkpoint_blockade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda131e0-ff23-4227-b366-817959285429/29457845203.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_off00008b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5A 4796 bytes
SHA-256: 34ca9dca745844f70037699ab29f0d7f1e2e97e198169898688b6d1b4d2bb852
font_01_sfnt_off00009b87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B87 10056 bytes
SHA-256: 7d8f92a615c6c60122d743f0102552c9c4b295c4042fd6b5d7ed15e3dc778ff8

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