Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9d72e76f622598…

MALICIOUS

PDF

40.6 KB Created: 2020-08-15 02:37:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf032df84c50c7cfebcef07bf53be500 SHA-1: 9bc9e8a6efcf1e7845895f0bb20f9b7ae48d9b12 SHA-256: 5f9d72e76f622598c25583346b28c4ace59f2c8b74ae6656e100c6460b1c3bff
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The primary malicious URL, 'https://ttraff.cc/pify?keyword=elements+of+art+worksheet+middle+school', is used to redirect users to potentially harmful content, likely a phishing or malware distribution site.

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.cc/pify?keyword=elements+of+art+worksheet+middle+school
    • http://files.ginetteandmichaeladopt.com/uploads/1/3/0/9/130969545/5bb9cc92.pdf
    • http://files.uqpalaeo.com/uploads/1/3/1/4/131407088/eb39f.pdf
    • http://files.jelisajayrobinson.com/uploads/1/3/0/7/130775897/7696fcc45da2ae.pdf
    • http://files.maslowspeak.com/uploads/1/3/1/4/131453934/3554054.pdf
    • http://files.tanyathehomestylegourmet.com/uploads/1/3/1/3/131382078/xelirid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8243/9063/files/1067155648.pdf
    • https://cdn.shopify.com/s/files/1/0434/4456/8216/files/building_maintenance_technology.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/bodologuzufef.pdf
    • https://cdn.shopify.com/s/files/1/0433/6179/6248/files/wolfgang_amadeus_mozart_biography.pdf
    • https://cdn.shopify.com/s/files/1/0432/0067/6001/files/sotiwiledakerukivopamil.pdf
    • https://cdn.shopify.com/s/files/1/0430/9401/6157/files/muxotofufivexe.pdf
    • https://cdn.shopify.com/s/files/1/0439/2042/5115/files/fuwib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0482/0631/files/graphic_design_books_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/ashraf_ali_thanvi_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/0428/0481/files/fabagoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/8328/4136/files/kobifagenixusukufapuroriw.pdf
    • https://cdn.shopify.com/s/files/1/0429/9980/8149/files/10443171473.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e83.bin
451a713c36c228b3bfb362b259f7eab383f3dad29674e0b45211549c820b10c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E83 5372 bytes
font_01_sfnt_off000060b2.bin
ff7e165e08db50f8e790519a52672a7fab5f2498c6c4760f2877062657b89b94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 8944 bytes
font_02_sfnt_off00007f85.bin
a520ab7a58d0d5eabecf41c647c9cdb7d4faf18153d08d5b22ffc89ca5cbd61f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F85 16188 bytes

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