Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a17bf8d050a9ea…

MALICIOUS

PDF

39.3 KB Created: 2020-09-01 06:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0e5005f89838330fb008369f0e68bbd SHA-1: 4d5a40ca710890c3ec0e0c965471171863aad282 SHA-256: d6a17bf8d050a9eafb2ce4dd0f2e7db3a8388d5cd4a5ba0fb6bd558e94ecf257
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on static.usrfiles.com. One of these links, https://ttraff.ru/wix?keyword=beintehaa+video+song, is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=beintehaa+video+song
    • https://static.usrfiles.com/ugd/02beb7_63136a8b14bf4b4b8eb9f076bb9b2796.pdf
    • https://static.usrfiles.com/ugd/b8c837_b97a0e3b72dc47ab8d3b8cce4610559d.pdf
    • https://static.usrfiles.com/ugd/b91566_b9a4964d8a4140d7845ada6d0dbad336.pdf
    • https://static.usrfiles.com/ugd/cc089a_c2fc0f93ea934f289509b281d118abf8.pdf
    • https://static.usrfiles.com/ugd/8b49c6_ae162c5e955942ac847b93862120fe45.pdf
    • https://static.usrfiles.com/ugd/b8c837_33f32cba077148099a8a8978c45a8aa4.pdf
    • https://static.usrfiles.com/ugd/ea2f88_5aea4387ab3a4120b6ae5ffda526d9e0.pdf
    • https://static.usrfiles.com/ugd/f0e51d_76cb748f88dd441180b18203c5657910.pdf
    • https://static.usrfiles.com/ugd/565485_34ae4ad04460475ab6a7654ae8dab002.pdf
    • https://static.usrfiles.com/ugd/ff2e72_05da857d336f47deb563a5c19d44507c.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc70e266c9364a3c9d1fcc36c4b3cfff.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gasowezigubufavowi.pdf
    • https://cdn.shopify.com/s/files/1/0440/6103/2598/files/tisunajatodedujosokugad.pdf
    • https://cdn.shopify.com/s/files/1/0433/6310/6968/files/5380553430.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_off00005281.bin
68b23f04b9ecbb077f69bf71e6eaf8c767db921ba8b896b0424c3843c1abb164		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5281 5068 bytes
font_01_sfnt_off000063cb.bin
d6c2154d27a88ca7c5448439d0b9a20d21a764e1e2385be0edd3d4399c445d7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CB 14292 bytes

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