Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d4181bd9d830cb…

MALICIOUS

PDF

73.7 KB Created: 2020-11-23 10:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e85dd242cff2054ba5289898ac11df6 SHA-1: 5ce0acf304ae8034d35754dee1815e38fd1b874f SHA-256: 39d4181bd9d830cb55b38756caaf063d1082c8a4c0009203e7d72e24eb98e42f
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffmen.ru/123?utm_term=shark+navigator+lift-away+bagless+upright+vacuum+cleaner+-+nv351+filter'. This, combined with a high ML classifier score and ClamAV detection, strongly indicates a malicious intent. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffmen.ru/123?utm_term=shark+navigator+lift-away+bagless+upright+vacuum+cleaner+-+nv351+filter
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5fb44fbeb7a50.pdf
    • https://cdn-cms.f-static.net/uploads/4386347/normal_5f8e635e422f2.pdf
    • https://cdn-cms.f-static.net/uploads/4500186/normal_5faff3916c4b8.pdf
    • https://cdn-cms.f-static.net/uploads/4379969/normal_5fa6311ab33fa.pdf
    • https://cdn-cms.f-static.net/uploads/4368486/normal_5f8819e60b3f1.pdf
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f8e084db7377.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f1096654-7836-4f69-8849-0bde334771eb/nivujudexifedofabeluduzu.pdf
    • https://uploads.strikinglycdn.com/files/b9efe3ee-197d-4743-a793-823af083ee10/4993772885.pdf
    • https://uploads.strikinglycdn.com/files/dd5c4420-e358-4bb5-9fa6-34ea3fc1e246/89727791081.pdf
    • https://uploads.strikinglycdn.com/files/af1e1758-56ee-4b52-aced-72a4ca2c6806/44000030951.pdf
    • https://s3.amazonaws.com/doxifuba/libro_monedas_y_billetes_de_colombia.pdf
    • https://uploads.strikinglycdn.com/files/c8851aaa-f73d-4093-900a-45fc2f08ab4a/how_long_is_a_click_in_distance.pdf
    • https://uploads.strikinglycdn.com/files/defda7a2-8cc9-4f0a-be15-2dd5a3acd8a9/42025115745.pdf
    • https://s3.amazonaws.com/tiduro/wenarutuzugaxiregepil.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd57.bin
750df7359448cdec4b2a56caee5faa14991c7ddf01f6ccbb582c11d57b286522
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD57 6360 bytes
font_01_sfnt_off0000f2fe.bin
110ed56070da73b98d18bfa4e5705395081893c3ffa467c725c72fcb523c630f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FE 10572 bytes