Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f2531e8a9b8b5a1…

MALICIOUS

PDF

42.8 KB Created: 2020-08-30 10:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3b5a674c007d56578709dac0eda37fd SHA-1: 3a751137d50705da392a68bc9e140dcea8f09685 SHA-256: 7f2531e8a9b8b5a16739891075f856967d27fd250293b9c2f853c9e1721e848f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, also contains the URL 'https://ttraff.ru/wix?keyword=what+is+the+text+structure', suggesting an attempt to lure the user to a malicious site. The presence of numerous other PDF links points to a link farm strategy, likely for SEO manipulation or distributing further malicious content.

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=what+is+the+text+structure
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/67f5f7_ee273014692748c18d4bcc87c96f26d7.pdf
    • https://static.usrfiles.com/ugd/0cd3a8_d908fe93d2194a54a38f4f61478cf6ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_5ebbf8250bd9413c8ee89fee0159f020.pdf
    • https://static.usrfiles.com/ugd/529dbf_a2c94cbc07884bbfb1240186e5570b1e.pdf
    • https://static.usrfiles.com/ugd/b8c837_228a3867b1294af7bf5aa8fe154c1dba.pdf
    • https://static.usrfiles.com/ugd/b8c837_ae5f892deb4240efa3521ac7d198d0d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e55b0cc4d754c5d9fd1f23723768bd5.pdf
    • https://static.usrfiles.com/ugd/0c4177_a69efb5893aa4d9a93f83b5038622df1.pdf
    • https://static.usrfiles.com/ugd/8b2c09_7b9e289297d8403f92ba491e7d1087b3.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/marofurolopag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/punubixelulufuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/0052/9049/files/tere_liye_ceros_dan_batozar.pdf
    • https://cdn.shopify.com/s/files/1/0437/7929/3338/files/31781718652.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_81207a946405420abd7d201f856cb61f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1796ddaa77c143c68fd607b0def975dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d29f84383674b1c9f043a0dd805f1cf.pdf
    • https://static.usrfiles.com/ugd/ecec20_97ca439ef8be49cb94d35804d0cf19cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_653b4965d3fb433f8d4c65a45cf23aa2.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b68.bin
f55edf1818c03071e5ec00eae053c78a34319a40e3b024f5be1ff9ffe053c9e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B68 4936 bytes
font_01_sfnt_off00007c37.bin
633723c9a2c044066f3b3a38b2dda492e82c4d7d61e3e65ef98ceedca878d4a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C37 9884 bytes

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