Malicious PDF — malware analysis report

Static analysis result for SHA-256 5583a7789be65a6a…

MALICIOUS

PDF

38.6 KB Created: 2020-10-30 01:40:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a2054ed42354ad61b1e7d538dc9426b SHA-1: 74b78de76a6e705e7fcab6152f8c8ae8af7ba25c SHA-256: 5583a7789be65a6a682ee8d4ce5c2567c21efafd0d15f65071d5a1e9ceea7aa3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL, 'https://ttraff.link/123?keyword=complete+electronics+self-teaching+guide+with+projects', likely leads to a malicious site. The document's structure and numerous external links suggest an attempt to manipulate search engine results or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ttraff.link/123?keyword=complete+electronics+self-teaching+guide+with+projects
    • https://cdn-cms.f-static.net/uploads/4367617/normal_5f8ef3a572779.pdf
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/xosabata.pdf
    • https://cdn-cms.f-static.net/uploads/4368478/normal_5f88311840dc5.pdf
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5f92a86a3fe0b.pdf
    • https://cdn-cms.f-static.net/uploads/4373749/normal_5f93867bf1f7e.pdf
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f8e5e07d4db9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d8651e58-cc93-41d3-85c5-275be1b10a12/godavuxivugosuwuv.pdf
    • https://uploads.strikinglycdn.com/files/c00c8d43-134f-4a77-bcb0-308e4a60e751/minh_chu_hc_vin_ngi_sao_phu_thu.pdf
    • https://uploads.strikinglycdn.com/files/1fc3a930-f16f-4afb-a48b-567e0bfb7ba8/life_seal_black.pdf
    • https://uploads.strikinglycdn.com/files/f3c2e6e7-c9c0-4948-b420-dd55584dd7a9/tulibekevifokitiruvaxenu.pdf
    • https://uploads.strikinglycdn.com/files/cc5597a3-1a40-43d7-9246-7de006794909/55855623170.pdf
    • https://uploads.strikinglycdn.com/files/82479321-65e0-4e00-99f3-39c7c2c95d07/bradley_hubbard_oil_lamp_parts.pdf
    • https://uploads.strikinglycdn.com/files/c303e276-88f7-4703-8da8-199a949f7deb/18014581541.pdf
    • https://uploads.strikinglycdn.com/files/0146d558-1875-4ea3-8da8-57f616eb9620/50094457095.pdf
    • https://uploads.strikinglycdn.com/files/cb622137-8873-44f5-971e-062e2d36f07f/stress_strain_curve_muscle.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_off00005669.bin
479f51cc0069e18fbc703b1870444ad0a7e2160a9eab45ba57244689e5567cce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5669 5672 bytes
font_01_sfnt_off000069a0.bin
28cc1622a73a84a78e48d43d49910ed7c176c8e0741e9d9144ee34bc72618dca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A0 10960 bytes

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