Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea458e8a56586751…

MALICIOUS

PDF

39.4 KB Created: 2020-08-31 17:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0a31b8edc99282be49b139683624f09 SHA-1: 223c2bad3341b806e6d523aa34456d102dee973d SHA-256: ea458e8a56586751221e845fac24b83a0f8bd214195dd78356a6af3bbb0571e5
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/wix?keyword=d+din+bold+font+free. This suggests the document's primary purpose is to redirect users to malicious infrastructure, likely for further exploitation or phishing. The ML classifier strongly supports the malicious nature of this PDF.

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=d+din+bold+font+free
    • https://cdn.shopify.com/s/files/1/0429/7896/7703/files/8310278504.pdf
    • https://cdn.shopify.com/s/files/1/0427/5548/9948/files/bovuzem.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/foxekufafuj.pdf
    • https://static.usrfiles.com/ugd/99afdc_6c66ab8fbea54756bd5866f3bf8e8aa5.pdf
    • https://static.usrfiles.com/ugd/9e14ca_d83c93c6a2ba432c93a52c60006a3efe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4615/6960/files/76434910284.pdf
    • https://cdn.shopify.com/s/files/1/0435/5106/4228/files/apologetica_catolica_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0462/3283/0106/files/muvederofoledobegew.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/velelebebofasedonakudimed.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2966/files/bihar_stet_computer_science_syllabus.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_off00005e42.bin
55949896ae9c94aaacaaf1cc4d8d424ad65779b39118dca9af70df39ae96bb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E42 4652 bytes
font_01_sfnt_off00006e1f.bin
362c622239ece7f5e1f1c523a00345f6620941f5fc85a9f7fa4007db7a612ed7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E1F 10436 bytes

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