Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfc25a7516a7b96…

MALICIOUS

PDF

42.5 KB Created: 2020-10-31 15:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 44575f39a3aa31fcad9c912db5ef9766 SHA-1: 1c28ab8ea8e7c431e009caee8de49c3cbedfed6c SHA-256: dcfc25a7516a7b966a1a98a7e4509af327b90d2a81683f50f1da7a524c6b84f4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'https://cctraff.ru/123?keyword=temple+of+kynareth+location'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, one of which is 'https://cdn.shopify.com/s/files/1/0430/5934/7618/files/uline_wire_shelving_assembly_instructions.pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to these URLs, suggesting an attempt to lure users to malicious sites.

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://cctraff.ru/123?keyword=temple+of+kynareth+location In 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/1/0430/5934/7618/files/uline_wire_shelving_assembly_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8991/1196/files/mega_man_x_best_boss_order.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9416/6683/files/yahoo_mail_download_folder_android.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5736/5159/files/dafupukatolib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/944d1d06-20d3-4e6d-a085-d429618de5fb/vofutadusurebu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6513/4244/files/4825903589.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/malayalam_calendar_2018_october.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/4606/3258/files/pure_kona_coffee_k_cups.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/67612325560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a018d3d-d690-4683-8c9e-06b55083ad50/18412573167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e060a25-66d1-4d59-aa5e-f71693510eef/tiborenusaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/6647/2631/files/multiplication_3rd_grade_common_core_worksheets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8231/0338/files/horseshoe_canyon_ranch_weather.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_off00006599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6599 5192 bytes
SHA-256: a44a59b7bc1d58e9e5210bfb96f3bc690b7e827b493772771a493d0b06822ee6
font_01_sfnt_off00007722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7722 11908 bytes
SHA-256: 33ded9b4e51db383739c15fdfc627d7d180196921eb42fca041977721a72a878

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