Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5cbaadf68dcf18…

MALICIOUS

PDF

33.6 KB Created: 2020-08-20 04:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d9b40e3f64e5d1ef2a8149b8066b2ca SHA-1: d3ed47dc560e59bf2cd6b12fa821e0af7281d329 SHA-256: aa5cbaadf68dcf18ac0330fbe6860e75713e00452463c12b94f1a6c8743486c2
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.ru/pify?keyword=abc+song+sheet+music+piano, which is also listed as a malicious redirector. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains, likely to manipulate search engine results and distribute malicious content.

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.
  • 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.
  • 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/pify?keyword=abc+song+sheet+music+piano
    • http://files.heavenonearthestates.com/uploads/1/3/0/7/130775232/zitan.pdf
    • https://cdn.shopify.com/s/files/1/0437/0730/2037/files/unix_kill_3.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2612/files/94804939218.pdf
    • https://cdn.shopify.com/s/files/1/0433/7487/0689/files/principles_of_biochemistry_lehninger_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/8069/5462/files/gogimanivanitejulonup.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/17992356533.pdf
    • https://cdn.shopify.com/s/files/1/0433/9489/1943/files/4952767027.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/unconfirmed_report_means_in_ecg.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_off000043e8.bin
dfcd41194fb485fdcd6dbc4aa13cb8bc99cfa0ef992567b306f77645571b1d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x43E8 5348 bytes
font_01_sfnt_off000055ea.bin
99d81f7f451d2e71c0689072ffafee6007d563b2b1707d1eec70c1fdc0637742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55EA 10608 bytes

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