Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23633e61c2e0d77…

MALICIOUS

PDF

36.5 KB Created: 2020-08-31 00:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c23df5af1f4305044313236df49128c SHA-1: 3b5b0bed2e7707e7e86765b4b7d198e7b1016fd5 SHA-256: d23633e61c2e0d77873f6a62c49697f0f7cc214edb399060464f1cd4f3c58411
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is highly indicative of malicious intent. The ML classifier also strongly flagged this PDF. The document body and metadata suggest it is a PDF document, but the primary malicious functionality appears to be the embedded link, which is designed to lure the user to a harmful external site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ttraff.cc/wix?keyword=r+and+s+motorsports+albuquerque
    • https://cdn.shopify.com/s/files/1/0447/7501/4566/files/caballo_de_troya_3_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7274/9721/files/benchmarking_definition.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/gosipuluzenoxenigasukepij.pdf
    • https://static.usrfiles.com/ugd/b8c837_69474a4c75ad4a7082ffc3506eac9552.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7182/files/probiotic_food_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/2797/1741/files/open_in_paint.pdf
    • https://cdn.shopify.com/s/files/1/0433/8027/7406/files/44049551990.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6552/files/airline_stewardess_uniform_history.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005081.bin
f01b6e02930822a05b17bc540433ad508b4b76b46b85c7d4efd8556942083fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5081 5376 bytes
font_01_sfnt_off000062a9.bin
7a0ad5c4832189dedaf26f36cd554065d7e6131590d8569200cf02670d2af211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A9 10396 bytes

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