Malicious PDF — malware analysis report

Static analysis result for SHA-256 e54fca3de3fc2acd…

MALICIOUS

PDF

44.2 KB Created: 2020-08-02 00:57:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 063ea8f5bac696c40a10de67c2aa86ea SHA-1: e750bf5e4984b9fbf561103adeff598328325339 SHA-256: e54fca3de3fc2acd63fc69cb867867d59346c7915e0fcf577846c0d01a2fa7f3
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, identified as a link farm, pointing to a redirector service. The primary malicious link, 'https://ttraff.ru/pify?keyword=fix+it+utilities', is designed to lead users to further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous links to a known malicious redirector is sufficient evidence for this assessment.

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=fix+it+utilities
    • http://files.quovadisconsultancy.com/uploads/1/3/1/4/131453432/suzeditozebozo.pdf
    • http://files.tohgallery.com/uploads/1/3/0/7/130776327/lupeku_zafosefaj_wexazufu_jegid.pdf
    • http://files.itsnotstreaming.com/uploads/1/3/0/7/130738673/26071.pdf
    • http://files.rcdesignceramics.com/uploads/1/3/1/8/131856290/2599222.pdf
    • http://files.acctngmatters.com/uploads/1/3/1/1/131164125/wibajonufup.pdf
    • https://cdn.shopify.com/s/files/1/0438/0898/1152/files/potiwilewan.pdf
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/45102160431.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7254/files/r_kelly_songs_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9599/0175/files/76189345577.pdf
    • https://cdn.shopify.com/s/files/1/0433/9076/3175/files/fasituw.pdf
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/42251784310.pdf
    • https://cdn.shopify.com/s/files/1/0430/7841/8583/files/rizavaputukixolusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/walasupufupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1013/files/sewadamawabakonetajamavi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7079/8489/files/98207987029.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/wixebo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/fekumurunurisapamaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/34794598927.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4585/files/sanezuj.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_off00007116.bin
663a5ff01e25ceaba255bdb1d9036e325004fe3cad46b8a139efd2b3543ef3cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7116 4396 bytes
font_01_sfnt_off00008024.bin
d6e8c88059b9bb00f3bcf810ba9cde1744d0ab37a73e0e6b068473d235d72fc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8024 10520 bytes

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