Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac16cea807d56da…

MALICIOUS

PDF

61.6 KB Created: 2020-11-06 09:20:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ab316314563151c1a580c446ade663c8 SHA-1: 1e89195e3895940bd9f500d03223ab8f16298124 SHA-256: 4ac16cea807d56dac8ed5c16cf4a980060210e98a920ccb6231f2ace0366643a
94 Risk Score

Malware Insights

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

The PDF contains a link to known malicious redirector infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The embedded URL 'https://cctraff.ru/123?keyword=madrid+monthly+weather+average' is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site.

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/123?keyword=madrid+monthly+weather+average In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417830/normal_5fa0eda84b1e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426087/normal_5f9bd6b79ca38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_5f9b89b6487fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_5fa242b6a1a44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445103/normal_5fa4f039a42d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408863/normal_5f95a0537147e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5f91b4caab550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365584/normal_5f870959349de.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/cd33b740-88e7-4ec9-b4ae-641586d49f39/vijiwag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c757774-d431-4add-afe5-a6ed8f1cb94b/zisikaderutoner.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b7d6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB7D6 27728 bytes
SHA-256: a1e9ebcf3f80b2d7873afe22aeaa3db4bf9508d80b536e5c086ec4765805c266
font_00_sfnt_off00007e09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E09 5320 bytes
SHA-256: d8d6e7f0f4c65822fcc08a8b41cf21d11edb715003977c6e87cf8b49739335b2
font_01_sfnt_off00009020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9020 12484 bytes
SHA-256: 306633fc2d68e38a49e2cdd7d9180646ec9d2ed7ee1222e4f0f1c3e3d018202d