Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17b5aa03065fd86…

MALICIOUS

PDF

43.1 KB Created: 2020-11-01 21:24:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 78d881d65685988b78cf0877b3f8d73b SHA-1: 5da9ba0f18dde74fba64c0191a299fa5c2db67ee SHA-256: c17b5aa03065fd862d78a0f63eb9e1582d9913244c9f1fd8379184500df2eaa5
94 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to a suspicious URL. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of the malicious URL suggests an attempt to lure the user to a harmful site, likely for further exploitation or phishing.

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/wb?keyword=carlson%20from%20of%20mice%20and%20men%20description In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415051/normal_5f95730463216.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f872a298d59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368950/normal_5f9b5598e9266.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372972/normal_5f9975816c01f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9938/1157/files/gegubegajudi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/5322/6433/files/pilatus_pc-12_ng_flight_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/donake/99029837858.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6321211e-cb72-4e76-b339-d046ed8642c7/57521020032.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1591/4151/files/mavunawi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/7639/3368/files/sanelewulejimus.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/5168/2454/files/90778173967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/6190/8134/files/sound_pollution_information_in_marathi.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_off00006c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 5208 bytes
SHA-256: 922929d53d43f86c51a52bed77c88a79eb44afab8471265dd9a2149c463a6d3f
font_01_sfnt_off00007deb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 9812 bytes
SHA-256: d7ef7097af1dea485724302a8b82adf5463156378a49ece0763f96a309bf2a07

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