Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3540b1c12d93f66…

MALICIOUS

PDF

49.0 KB Created: 2020-08-29 14:57:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f33644dea8e670562024642180b3d41 SHA-1: ab389ce5ab09fb5d70cc8095b96076c1203fb344 SHA-256: d3540b1c12d93f6614aa4e6a1da4a35278b1d7779c87a7c01fdf8118e9e5805b
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=my+own+words+ruth+bader+ginsburg+pdf'. This indicates the document's primary purpose is to redirect users to malicious infrastructure. The presence of a large number of external PDF links, while many are marked benign, suggests a link farm or SEO poisoning attempt to increase visibility of the malicious redirector. The ML classifier also strongly flagged this PDF as malicious.

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/wix?keyword=my+own+words+ruth+bader+ginsburg+pdf
    • https://static.usrfiles.com/ugd/ea9bdf_face27ef951b4020b6c49a1948f5ed70.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb973119c11473c929f99e9e82a0979.pdf
    • https://static.usrfiles.com/ugd/067ecb_117a309eb3284150b595bd56de92762d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3fbf20b3a4684a5ba762c53a39b1ad9c.pdf
    • https://static.usrfiles.com/ugd/b8c837_c27ff4de9b084cd0af3de24de0201462.pdf
    • https://static.usrfiles.com/ugd/b8c837_30c621700f0e4c5eb2ff5d703deefa45.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2a64e9ec32d43a7ada7c7ae41efe6a7.pdf
    • https://static.usrfiles.com/ugd/b8c837_3516c67845fd40e2adecda447aa46ce6.pdf
    • https://cdn.shopify.com/s/files/1/0431/4005/5208/files/antecedentes_del_alcoholismo_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/chess_analyse_this_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/0691/0887/files/31416592404.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e3e827f545842c9ad5eab9ce9d56d32.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.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_off00008199.bin
09ee9b2a98310a8955ca57e0072f3be653a88fc942718421f2fde02e41788e3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8199 5608 bytes
font_01_sfnt_off000094c9.bin
e267fd1a91516b198b208924757f58459947d8bb828b14e3a3ffda7930a0f35b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C9 10036 bytes

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