Malicious PDF — malware analysis report

Static analysis result for SHA-256 a11eec4858248d28…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 23:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29ba814842cc217b3f2997e37e3356dd SHA-1: 2690ac649f4a4178d582243de40bd219ce7d995d SHA-256: a11eec4858248d287651c84b4111e69fbc8fe6e511c6da8e694595a09019a193
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=kindle+for+pc+with+accessibility+plugin'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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=kindle+for+pc+with+accessibility+plugin
    • https://static.usrfiles.com/ugd/b13fd1_93a078850e1e4894a1e2f9de8c5effef.pdf
    • https://static.usrfiles.com/ugd/36f25b_acd35dc9aab24d1daac15c12c501875d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a00b39fa349240669eb7eb1927b1ac20.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834bcfd68bd46e392f192ff386ad85c.pdf
    • https://static.usrfiles.com/ugd/9b33c5_ec070bc6237e436990c97eb362820a4b.pdf
    • https://static.usrfiles.com/ugd/3e87bf_49530241231d4b5582ba2b97bd868288.pdf
    • https://static.usrfiles.com/ugd/b58d21_fa3a2389d69c44eb8b2d0a6d1cd031ba.pdf
    • https://static.usrfiles.com/ugd/6c98bc_6720a6881d8d44e0996b6a248eb48cc2.pdf
    • https://static.usrfiles.com/ugd/455f95_9e3e14ddf46e4e7291b81ba02eb422ae.pdf
    • https://static.usrfiles.com/ugd/b8c837_72e9c39d86e94f288a36cc2c4e53eecc.pdf
    • https://static.usrfiles.com/ugd/3fc21f_5781194226b04c7780b0048b279843b0.pdf
    • https://static.usrfiles.com/ugd/77eba6_5933b517673a41bc883fb590c3981d94.pdf
    • https://static.usrfiles.com/ugd/b8c837_90377477b0904e5ababda945b3dd6dce.pdf
    • https://static.usrfiles.com/ugd/b8c837_24029676a1e841fd88e991b941f4c2c0.pdf
    • https://static.usrfiles.com/ugd/b8c837_1203834decad448b98ae5f210da8ec49.pdf
    • https://static.usrfiles.com/ugd/b8c837_d10816cdf84f4571815ab62f637a5402.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/
    • https://static.usrfiles.com/ugd/b8c837_240

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006554.bin
df7ee52493b8e450ae8bab0eabe881bc42ba76b4f6db9efa154d5cef203f157c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6554 5720 bytes
font_01_sfnt_off000078cb.bin
322c8d242048b45227231c4f50ff7b717c0fb10dfb6a7862e018571ad9abc1ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CB 9908 bytes

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