Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c681d5e4403fc37…

MALICIOUS

PDF

60.3 KB Created: 2020-08-31 00:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a740d0e7faf90828fc17a38ead6199ae SHA-1: c17895e50746756d31c669ca26dce5514211270d SHA-256: 0c681d5e4403fc37b641f108b3033233e7449a1c9dd2e67ce035714c768595c0
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.com/wix?keyword=cr%25C3%25A8me+de+pommade+anestol, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into clicking it. No scripts were extracted, but the heuristic firings strongly indicate a link-farming or redirection attack.

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.com/wix?keyword=cr%25C3%25A8me+de+pommade+anestol
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0462/0058/6398/files/hello_neighbor_gametrex.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/puxatofutedixa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/ielts_journal_target_band_7.pdf
    • https://cdn.shopify.com/s/files/1/0435/9490/7810/files/sublime_text_2_install_package.pdf
    • https://static.usrfiles.com/ugd/b8c837_31b9de4785a74f6d8c7e70ad1ce593df.pdf
    • https://static.usrfiles.com/ugd/764aaa_de311f45f03447bd9c8d60f69efd5ba6.pdf
    • https://static.usrfiles.com/ugd/b80405_85100a8d7daa46da8465ab91bec09dd5.pdf
    • https://static.usrfiles.com/ugd/7baf93_8ebc8c5dc0e549a881dfb3d06e3db051.pdf
    • https://static.usrfiles.com/ugd/b914b5_d0756a00dcd344cca85ad0272a7b9568.pdf
    • https://static.usrfiles.com/ugd/b8c837_ac947309aaed413a945ce7c4bb124e90.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fb678a846046bdaea36084b9351022.pdf
    • https://static.usrfiles.com/ugd/fd30ac_ab6398c4d9b84b68bcfd8a817700429f.pdf
    • https://static.usrfiles.com/ugd/83b1b3_37c998c4bdeb435293181175f8e4b07e.pdf
    • https://static.usrfiles.com/ugd/3b47cb_269118bb732c4ccbab2512263c31b40b.pdf
    • https://static.usrfiles.com/ugd/32acb1_6fe6fc9c15ef48dfb6e7b1d993ad5fd6.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_4eeab715d08445c782de8c4764669283.pdf
    • https://static.usrfiles.com/ugd/516574_b16ab9e033ee424384c9adfd39740949.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_off0000a8b0.bin
2f5a18cf4b17adcd440379109ae3483a7d6c66c08d6a3bbe26b40e0b6d18b615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8B0 5152 bytes
font_01_sfnt_off0000b9c7.bin
767d6ad729a666095ae381c499d3c5da0868afeda029cc6e16fd4991cd9b1115		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C7 13052 bytes

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