Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d6f049a0b9e3c7…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 08:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 432485ecb6d55307a5c5aab8ac3e78c0 SHA-1: e20dfd723057eb760b4947648f7b44c074d84410 SHA-256: f4d6f049a0b9e3c76a6f8886e43955c05e27250da12bfad74a7f02892b0ff40e
120 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=common+english+words+used+in+daily+life+pdf'. This indicates the document's primary purpose is to lure the user to a potentially harmful external site. The PDF also exhibits characteristics of a link farm, embedding numerous other PDF links, likely for SEO manipulation or to obscure the malicious redirect. No scripts were extracted, and the document body is heavily obfuscated.

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=common+english+words+used+in+daily+life+pdf
    • https://cdn.shopify.com/s/files/1/0430/5754/5365/files/neuroblastoma_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/subuforazavotiku.pdf
    • https://cdn.shopify.com/s/files/1/0438/2579/1138/files/fojurosemowefaz.pdf
    • https://static.usrfiles.com/ugd/c4ccc4_ec56321d24514ef58cc5ab6dfd6746d9.pdf
    • https://static.usrfiles.com/ugd/b0b521_e1ebfc9bc29e42199b6cd09e8c8bb302.pdf
    • https://static.usrfiles.com/ugd/76de1a_60db8d6965c44966b6eaf645393a60b7.pdf
    • https://static.usrfiles.com/ugd/21e6f2_262ae47b61c94f16b6837f4914bd4413.pdf
    • https://static.usrfiles.com/ugd/fdee49_b1dfd1ab906141f7bfbedd4a6323e6ef.pdf
    • https://static.usrfiles.com/ugd/89363e_eecf5eeb264b417eba6ca7acc2a49b69.pdf
    • https://static.usrfiles.com/ugd/b8c837_175f96dd976f40d58580415c47c74b16.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b998c5c6bf843ad91163d9da3dd33ce.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2221ff361a9486cbb9e7216a1bcb6bd.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e6d.bin
b184411bd88faf04d20f311454ff9bdf9aa7e1d7b9514994f278272d1e52103a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E6D 5476 bytes
font_01_sfnt_off000060ec.bin
91dbef2f33daac133fcfd25c237dd9b1392ed9da2e4c7b3a19fa57df574c32a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EC 9884 bytes
font_02_sfnt_off00008288.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8288 4324 bytes

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