Malicious PDF — malware analysis report

Static analysis result for SHA-256 38de8bf26d7541c5…

MALICIOUS

PDF

41.9 KB Created: 2020-08-09 00:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfd428875f7f4b74573b70084e9b0121 SHA-1: b6762cc1f0f595dc593431f11d4d2f84d9918f23 SHA-256: 38de8bf26d7541c512e3645e08d37e5335bcd73035e3a925339e24c50e1934f4
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=book+folding+patterns+free+pdf', which is flagged as malicious. This suggests the PDF is designed to trick users into visiting a malicious site under the guise of offering free book folding patterns.

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/pify?keyword=book+folding+patterns+free+pdf
    • http://files.forresterflooring.net/uploads/1/3/2/6/132695467/jajudodabikize.pdf
    • http://files.thesouthernsheshed.com/uploads/1/3/1/4/131453354/dadimuzeloxogeforu.pdf
    • http://files.mackjennifer.com/uploads/1/3/0/7/130739525/zuxad-kopexuxozimiwuk.pdf
    • http://files.mhsdesigns.net/uploads/1/3/2/6/132682892/4681903.pdf
    • http://files.millennialbarbers.com/uploads/1/3/2/7/132740873/5594280.pdf
    • https://cdn.shopify.com/s/files/1/0438/0593/3730/files/riteruxosulibokukaze.pdf
    • https://cdn.shopify.com/s/files/1/0435/5063/8241/files/pugolosuni.pdf
    • https://cdn.shopify.com/s/files/1/0431/9641/6161/files/jobapulewunopol.pdf
    • https://cdn.shopify.com/s/files/1/0431/3330/4986/files/mepugamolizowepumuxasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/4324/8533/files/kesabezaxawiwazutujevisak.pdf
    • https://cdn.shopify.com/s/files/1/0432/5625/0525/files/woketunuwunavas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5672/5153/files/10145501048.pdf
    • https://cdn.shopify.com/s/files/1/0432/2230/2888/files/bakekiwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/3642/5883/files/favafar.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/3598865852.pdf
    • https://cdn.shopify.com/s/files/1/0434/9231/1206/files/pusepadowakagave.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/zopojudivevopubujinenobuj.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_off000065cf.bin
e6e232323ebf96f18bdef099bbbf0c41b26d2c32cbded19f92794a8186fd3150		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65CF 5320 bytes
font_01_sfnt_off00007803.bin
8ac52ee37c620e10c0a02f3619f337875e4bd14f03a007d5f10034127b30fe2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 10324 bytes

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