Malicious PDF — malware analysis report

Static analysis result for SHA-256 61b10d066fa3af86…

MALICIOUS

PDF

45.6 KB Created: 2020-10-16 06:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 42dda6bce2f6ab01276157e33556e623 SHA-1: 2b4d26abbb76eaf618c8933557a1d93a9c3c6905 SHA-256: 61b10d066fa3af86995afb96cf99bf4d2072da00ef44b712af4be51e1c78585a
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a known malicious redirector. The ML classifier also flagged this PDF with high confidence. The presence of embedded URLs and the link farm nature suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/strik?keyword=similar+android+games+to+summertime+saga In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367919/normal_5f88ca779d11f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f889240dea8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366350/normal_5f88a1c272124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369763/normal_5f88bc365f070.pdfIn PDF document text
    • https://site-1037018.mozfiles.com/files/1037018/71258453341.pdfIn PDF document text
    • https://site-1040442.mozfiles.com/files/1040442/73322374710.pdfIn PDF document text
    • https://site-1043126.mozfiles.com/files/1043126/66699070493.pdfIn PDF document text
    • https://site-1038831.mozfiles.com/files/1038831/36478578120.pdfIn PDF document text
    • https://site-1043691.mozfiles.com/files/1043691/xopakuxigesape.pdfIn PDF document text
    • https://site-1042282.mozfiles.com/files/1042282/4189315138.pdfIn PDF document text
    • https://site-1043279.mozfiles.com/files/1043279/vubaxinufibagijofamufew.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://cdn.shopify.com/s/files/1/0496/5895/3885/files/ama_sample_paper.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/6190/7108/files/19158023417.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a42c69fb-2e59-4797-9ad9-644a3180d9f0/36375993581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21479898-e901-4943-8ce6-04a07f4c469d/32658574515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1236f4f5-6235-455f-ae3a-2a7ef4ea7528/35787171542.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69cdbdd0-b1b3-4c4a-b95a-b979309fa32e/returagobopewanij.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_off00006806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6806 5132 bytes
SHA-256: 203fdfa0510b79557f8003f181ef9ed1e86745a61e9ee4b9531187869e5ef48b
font_01_sfnt_off00007948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7948 9920 bytes
SHA-256: c28fc96e58fe14ed33659f82ce8a58d2d2b7647813eca0abc81db4430f94dd8f
font_02_sfnt_off00009b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3F 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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