Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d1b6514ffe7d6e…

MALICIOUS

PDF

42.2 KB Created: 2020-09-01 16:20:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7957b410ff96f6e1e1a45b795c73a3a SHA-1: d24c676b320d1fc0f53a655f9fe7d66e27ec82c8 SHA-256: d3d1b6514ffe7d6ef6b718d387757f95b9288909104d5d760df0372efedfe341
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=canserbero+biografia+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains references to the redirector URL and numerous other benign-looking PDF links, suggesting a link farm tactic. The ML classifier also strongly flagged this PDF as malicious.

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=canserbero+biografia+pdf
    • https://cdn.shopify.com/s/files/1/0428/4170/2567/files/40962834128.pdf
    • https://cdn.shopify.com/s/files/1/0428/9429/5203/files/chinese_birth_chart.pdf
    • https://cdn.shopify.com/s/files/1/0464/9487/5800/files/jimatisudobejawumosubipov.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/95657888303.pdf
    • https://cdn.shopify.com/s/files/1/0434/8575/7606/files/artistry_youth_xtend.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/97539556882.pdf
    • https://cdn.shopify.com/s/files/1/0427/9091/2159/files/40114387262.pdf
    • https://cdn.shopify.com/s/files/1/0427/4274/3207/files/fofezebobadozo.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/game_bloody_roar_ps1_android.pdf
    • https://cdn.shopify.com/s/files/1/0447/9008/7829/files/gaxozegopafujiruvupuwijez.pdf
    • https://cdn.shopify.com/s/files/1/0431/1387/3569/files/43203608069.pdf
    • https://static.usrfiles.com/ugd/b8c837_c158ba2cfbc04189b35daf60ae48f1cc.pdf
    • https://static.usrfiles.com/ugd/b8c837_e00a3a6dbe5044e19e79717ded6e2396.pdf
    • https://static.usrfiles.com/ugd/e23fbb_c8398cd1b8a446fd9b6d0c92da942ef8.pdf
    • https://static.usrfiles.com/ugd/a107db_1a35d75082684363be902d84ddc5d177.pdf
    • https://static.usrfiles.com/ugd/b56239_b520f12430384bbab530dfa466e4249c.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_off00006867.bin
dfae251ab17575e2fe07786b1fdf841e4b5b635bd4d75bda02497a4d7b4f72c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6867 5220 bytes
font_01_sfnt_off00007a31.bin
18e915bc0769d2cbe08da57b332712ca12b7fb03d899c285565d7deeb1e1878f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A31 10028 bytes

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