Malicious PDF — malware analysis report

Static analysis result for SHA-256 928a9754a0a464ad…

MALICIOUS

PDF

43.1 KB Created: 2020-10-29 23:44:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: cd5ff30ca935050f96d1bb99806f2816 SHA-1: 21a65d713c8f6bc1c094459536cb50026cdcd682 SHA-256: 928a9754a0a464adbd8d65e056a496dbd7478f369654e5b412d05eb04fcfa471
162 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known malicious redirectors and a link farm designed to artificially inflate SEO. The document body contains a URL that appears to be a lure for downloading software, presented alongside a visual download button heuristic. The presence of embedded URLs and the ML classifier's high confidence score strongly suggest this document is designed to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?keyword=cyberghost+apk+download In PDF document text
    • https://bubixoduxufito.weebly.com/uploads/1/3/1/0/131070588/gowaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387919/normal_5f99048540d95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374380/normal_5f89a33dd5586.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/suxudagojos_webegomuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5f8753f57b1d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366965/normal_5f900c5c77db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366008/normal_5f89ea8b4727a.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/827747.pdfIn PDF document text
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/d71767245d03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402262/normal_5f9523e49c5e9.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/846c5.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/memul/4555864284.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_off00006824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6824 5524 bytes
SHA-256: 7fc70e5c994953fc60243e56be4c3e3b00261a31918dfe372b4ab9fef733e7d5
font_01_sfnt_off00007af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF7 10760 bytes
SHA-256: f77b9fe0eae6d2fdd1a85c125b32828600197d84abfe9b3ba4d9a29574ac8e61

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