Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf8f860c8aa6cbb…

MALICIOUS

PDF

57.3 KB Created: 2020-08-17 05:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae5476f7613bc3f5b1e1e8711be9c52e SHA-1: 740141889c2cdb3452f512a5b254ad040ce38470 SHA-256: 8cf8f860c8aa6cbb6e83c9d63b03cef5b6a593778a0652873fe5bcf522c5b52a
150 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.ru, which is likely used to obscure the final destination of the malicious payload. The document also exhibits characteristics of a PDF link farm, with numerous embedded links pointing to various PDF files, likely for SEO poisoning or to distribute the malicious redirector. The ML classifier strongly indicates maliciousness.

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=digestive+tract+histology+pdf
    • http://files.bbluntsheabutter.shop/uploads/1/3/1/3/131383018/bajof.pdf
    • http://sogaror.uilmusicregion11.com/uploads/1/3/0/7/130740178/4320fb5899.pdf
    • https://cdn.shopify.com/s/files/1/0431/5987/9841/files/74105315617.pdf
    • https://cdn.shopify.com/s/files/1/0435/0751/5558/files/76970335395.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/zepijuferutivimol.pdf
    • https://cdn.shopify.com/s/files/1/0439/0571/2296/files/oliver_twist_1948.pdf
    • https://cdn.shopify.com/s/files/1/0429/9603/9833/files/minecraft_missile_war.pdf
    • https://cdn.shopify.com/s/files/1/0433/8833/8330/files/twitter_video_ios_app.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/kopelebujuxut.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/estequiometria_agamenon.pdf
    • https://cdn.shopify.com/s/files/1/0430/0183/9775/files/indented_key_and_bracketed_key.pdf
    • https://cdn.shopify.com/s/files/1/0437/9826/6018/files/waxoligotasilotikoridi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1787/1255/files/85947301994.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_off0000a1c8.bin
e744ebe8c30b1e2495ba713f468e6d3f7105aeec01d5bab9f62f014e4fa5f7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1C8 5580 bytes
font_01_sfnt_off0000b4cc.bin
953eed56ec64920adf89264bce2c81b95f6a6b8f420f878f8870c88bd39641ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 10972 bytes

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