Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf0aa0fe1d59a25e…

MALICIOUS

PDF

46.4 KB Created: 2020-08-30 03:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aab7fc5e7f0b8f8057817ead5f2506b4 SHA-1: 5cd523807cf506862d3ba399d891cccc9fd6ed6e SHA-256: bf0aa0fe1d59a25ea3be1b5fda4ba411d2ceb88e72053bb5189984a8fb288e9c
150 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure (ttraff.com). Another critical heuristic identified a large number of external PDF links, suggesting a link farm for SEO manipulation or traffic redirection. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL https://ttraff.com/wix?keyword=citroen+ds4+manual, which is likely the primary lure.

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.com/wix?keyword=citroen+ds4+manual
    • https://cdn.shopify.com/s/files/1/0463/2028/7904/files/wuwajigu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/idc_technologies_spam.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/23060356539.pdf
    • https://cdn.shopify.com/s/files/1/0431/3595/9191/files/nusigovetute.pdf
    • https://cdn.shopify.com/s/files/1/0435/4991/7333/files/54847703588.pdf
    • https://cdn.shopify.com/s/files/1/0435/5656/9249/files/65938652716.pdf
    • https://static.usrfiles.com/ugd/43d598_4dd7badbb38f42bb8d933e6bc0bc4c27.pdf
    • https://static.usrfiles.com/ugd/05900a_c0a757a67aa04516918f2fd3922677a3.pdf
    • https://static.usrfiles.com/ugd/b52961_3f27170d9c9647d18d5bd5a5322652fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_c3f3873bd5d94985827907ad64daa3e0.pdf
    • https://static.usrfiles.com/ugd/3f80ec_f5cfd45aab5b42fd82dc4e357a62d600.pdf
    • https://static.usrfiles.com/ugd/b8c837_20d82a16a88e4f5791e57b7def2b1a52.pdf
    • https://static.usrfiles.com/ugd/353d00_2006be9288bc462dbc9e311fa3afada3.pdf
    • https://static.usrfiles.com/ugd/314c35_dc2e7f5900ba4d96ac7d45b5f7e18f41.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_off0000791b.bin
8e3835780d4be4b4bde7ee6e088dc5469fa44477c6363155e49a0d6871516b87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x791B 4964 bytes
font_01_sfnt_off000089e0.bin
54ceb243038ab4e8a60b40a2666bde724f1fdbe96b1f5b1376164b29190ab571		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E0 10296 bytes

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