Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0bf9e25b6d5e10…

MALICIOUS

PDF

43.0 KB Created: 2020-08-30 10:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e0c653ea66c77da4645fc175625458 SHA-1: 3c1da507b6e0c4dc496307e59607ea27d37f2797 SHA-256: be0bf9e25b6d5e10f88e0361f9032584238a942a1b081b3bb7d2c4341386205a
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, characteristic of a link farm. One of these links, https://ttraff.ru/wix?keyword=tv+player+app, is identified as a known malicious redirector. The presence of this redirector, combined with the ML classifier flagging the PDF as malicious, strongly suggests a malicious intent, likely to lure users to malicious content or phishing sites.

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=tv+player+app
    • https://static.usrfiles.com/ugd/b8c837_7b0858a8111249ca9bf11a06f1dafa58.pdf
    • https://static.usrfiles.com/ugd/b8c837_85aecc8df6674150ab51778ad6bada5f.pdf
    • https://static.usrfiles.com/ugd/3e9e83_66c5743e8c424999a6721afed2709d55.pdf
    • https://static.usrfiles.com/ugd/158fb9_e77eee8d77a84eccb81024e8ca057f6a.pdf
    • https://static.usrfiles.com/ugd/a91264_ad449655b6b140c3aa06e965dbf56e2b.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc7aa24064ba448a99e040353308ca38.pdf
    • https://static.usrfiles.com/ugd/b8c837_5256334a210048ee94a97f102978c2ba.pdf
    • https://static.usrfiles.com/ugd/73f3b0_d453b1e7f1fd436a8280868d86c365a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d04725056f84c449c35b8d488686844.pdf
    • https://static.usrfiles.com/ugd/5b9a87_2c9a9f22535840928d77c2aad26c7b6b.pdf
    • https://static.usrfiles.com/ugd/f14cf6_f47d024fab884b89955cebd4aca3e4b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_72d4d373bbd24959b2e36528554b99ea.pdf
    • https://static.usrfiles.com/ugd/b8c837_eede3ab716d54fe9b473468c1b025f2a.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_off00006b98.bin
fbdf176a512d76d536152df4ef0acb57ad7b68c21f62468e318aa6da12727ad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B98 4748 bytes
font_01_sfnt_off00007bda.bin
668c3a1d90af27a4c8e76d3ca75573397d8c39141d2a529f7425c5ab88cfb429		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BDA 10604 bytes

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