Malicious PDF — malware analysis report

Static analysis result for SHA-256 af10877ba931ea13…

MALICIOUS

PDF

50.8 KB Created: 2020-10-12 03:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3e3c2005b11a22767c71017967f4f758 SHA-1: 84f0cb343973a928856bfaf1a68a667de874542a SHA-256: af10877ba931ea13c0e107bd0ed219e8c434ec48a316479e9704a606827e4a07
94 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The embedded URL, 'https://cctraff.ru/strik?keyword=rabbi+dr.+abraham+twerski+books+pdf', is the primary indicator of malicious intent. While no scripts were extracted, the PDF structure and the malicious URL strongly suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

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/strik?keyword=rabbi+dr.+abraham+twerski+books+pdf In PDF document text
    • http://tirezur.bluoceanstore.com/uploads/1/3/0/7/130775229/nojorunofoteliku.pdfIn PDF document text
    • http://files.fiordamalfi.com/uploads/1/3/1/3/131379719/gememok-tebiju.pdfIn PDF document text
    • https://site-1038495.mozfiles.com/files/1038495/35705189889.pdfIn PDF document text
    • https://site-1039148.mozfiles.com/files/1039148/61436193740.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f148f40-f028-4e78-886a-90c61d762988/navitixavovuripivoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d397bec-5899-4a86-bb0e-268ce56d540c/87872746331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15921ee0-acda-46e5-a176-701d345ccf6e/dupujavisutumofogoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93c35d3a-8564-4ff7-a017-2ce141184c38/zuxeneb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/0902/2376/files/turner_elementary_school_albany_ga.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9002/5375/files/concept_map_digestive_system_life_science_book_b.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/4464/2202/files/tufopes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/wosinotabejonexepabuf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2158/3004/files/wajekikexogadinerikamup.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_off000082c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82C8 5584 bytes
SHA-256: 91c62edda69a6a4e3281a24bd9b38974258212b05e484e235b084b40ed6fe69d
font_01_sfnt_off000095b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95B1 11960 bytes
SHA-256: 4a61495bb9852c20c8b990426d6c742ef891871f208e50d0694683d55db98638

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