Malicious PDF — malware analysis report

Static analysis result for SHA-256 12852f0bedeb60fc…

MALICIOUS

PDF

39.8 KB Created: 2020-08-30 05:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7b1714d381d91a29a158bc50ed7bc4f SHA-1: 1de1aa381b6f37fc455c26fa1d87480de3dac980 SHA-256: 12852f0bedeb60fce544e497ced20832f6a5bd86ef1d0df5b78e7ca68bd92296
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a large number of embedded URLs, many of which point to other PDF files. One URL, 'https://ttraff.ru/wix?keyword=mla+footnotes+example', is identified as a malicious redirector. This suggests the PDF is part of a link farm designed to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body is heavily obfuscated.

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.ru/wix?keyword=mla+footnotes+example
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/1910_constitution_of_south_africa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45292738862.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/zatil.pdf
    • https://static.usrfiles.com/ugd/b52961_978c3e557da946a39fa2ed19fb5c9ee5.pdf
    • https://static.usrfiles.com/ugd/086daf_cafd32e0a53143d9bba8e17634dceb59.pdf
    • https://static.usrfiles.com/ugd/b8c837_27a1d5dae6d6492e9c161aa61f94b069.pdf
    • https://static.usrfiles.com/ugd/b8c837_cae205891ee14df2a6350cbbf637fad2.pdf
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://static.usrfiles.com/ugd/80c1db_7b3fe550959a4ea8ad09732b26cdc5a6.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_off00005e9e.bin
7ca57ab8e2fc31d4337ce32ce78913991d05a72600e00a19edd83b71ceda6eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E9E 5024 bytes
font_01_sfnt_off00006fb5.bin
6ba3c4617ca86c8e448b5ec2248d48a07afedf34691d44573eb95fa3c0205d20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB5 10736 bytes

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