Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea43dca5311ae0a9…

MALICIOUS

PDF

48.0 KB Created: 2020-08-29 12:41:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ba8a201b6e1cdef2d193c2b64f3a9cb8 SHA-1: 43464da9776227e8681cee9023659b545c0c5910 SHA-256: ea43dca5311ae0a93d249735dc30e28f1d8fee4274325958c95799b70184a30d
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags the URL https://ttraff.ru/wix?keyword=beretta+76+wood+grips as malicious. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of the file.

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=beretta+76+wood+grips
    • https://static.usrfiles.com/ugd/b8c837_644e97eb98dd42d49388835904e8fcda.pdf
    • https://static.usrfiles.com/ugd/b8c837_c1206fbd2697436f99aac9899033b8ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ed200aed87e4ea1a73cab8ce8290936.pdf
    • https://static.usrfiles.com/ugd/b8c837_808ed6bc52454164bcfb3ea2763fa2b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_82d68c2fe8a948b0bf6390ae701f5144.pdf
    • https://static.usrfiles.com/ugd/b8c837_d67d8056b5154b03857102a7e4b00ac6.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/pedir_preterite_conjugation.pdf
    • https://cdn.shopify.com/s/files/1/0427/5997/9174/files/63012434540.pdf
    • https://cdn.shopify.com/s/files/1/0437/4695/1319/files/tb12_nutrition_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7966/3765/files/admiral_travel_insurance_claim_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8994/files/16923081329.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e5b.bin
8dec82fd3ebac20fcf66bf078366103cd4c5f746f75aee8024c271adc61db479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E5B 5152 bytes
font_01_sfnt_off00008011.bin
aaff2990b784581f97b0c36bb446d174df1b4632fe83a717ee3d2851cf226854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8011 10804 bytes
font_02_sfnt_off0000a4fc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4FC 4324 bytes

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