Malicious PDF — malware analysis report

Static analysis result for SHA-256 938889996e6732c7…

MALICIOUS

PDF

66.3 KB Created: 2020-11-25 16:42:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: f6e8c2b9136bd90fc8a6575be1995b55 SHA-1: dd0ecb9679c7687a306be30542ccfe41d4893e65 SHA-256: 938889996e6732c73579384e2bb35833f3d731b12df9f479ea442a7e7654d244
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong intent to direct users to malicious infrastructure. The ML classifier also flagged this PDF with high confidence. Although no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/strik?utm_term=ms+access+2003+tutorial In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f886eff28825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426422/normal_5fa0df2032bf6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413369/normal_5fa34da5845d3.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5fa92033c8715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371244/normal_5f9fa4fa361b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421613/normal_5f9f5d618bd7b.pdfIn PDF document text
    • https://xitukuwelup.weebly.com/uploads/1/3/4/3/134340625/6391395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495050/normal_5faf7f8734765.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371812/normal_5fb5ca04d1ec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407818/normal_5fbb59c44c7d0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/3054014e-00e2-4556-ac41-1282709ecb38/41955845522.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA95 5012 bytes
SHA-256: 48d3e0d6fbddc14bac92fcc86dce5c699bac6b6f58fb80ba9260d140da597525
font_01_sfnt_off0000cbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAA 10100 bytes
SHA-256: c39d3467dd4be0d89fa814b1b1bbacebafd4a201efcfbe1837e8ee21803bf4f8
font_02_sfnt_off0000ee1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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