Malicious PDF — malware analysis report

Static analysis result for SHA-256 722e0ae4a7484e9c…

MALICIOUS

PDF

33.5 KB Created: 2020-08-30 04:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f641dd4590e831999e8ab3f6eaa18722 SHA-1: 662bcb007d512f241eab052d0c5f883f3d26d9e5 SHA-256: 722e0ae4a7484e9ce0d67236d4932f3f6f9568f47e176d1575c035c59f830bf7
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, masquerading as book resources, which is indicative of a link farm or SEO manipulation tactic. One of these links, https://ttraff.com/wix?keyword=ayurveda+books+in+bengali+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting an attempt to drive traffic to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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.com/wix?keyword=ayurveda+books+in+bengali+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/7198c1_11a8dcb8d2da4ca4b1d6f6adafd668be.pdf
    • https://static.usrfiles.com/ugd/2e79a6_29823255f54649fc881199d5e5977a1c.pdf
    • https://static.usrfiles.com/ugd/b8c837_afc8f188e4a548d1bacb7fcad7aeffd4.pdf
    • https://static.usrfiles.com/ugd/067ecb_6f6caffbe03d40e0a93a2a83e9a08bc7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d2fc01be6ca84681814b5d766f228403.pdf
    • https://cdn.shopify.com/s/files/1/0431/4382/3517/files/mixibepezigowuzovasisu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7461/6473/files/vobuvixe.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1560/files/biblia_de_estudio_thompson_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0429/6078/1465/files/wogatoxuzisebatefajalajif.pdf
    • https://cdn.shopify.com/s/files/1/0430/5344/9367/files/98604112024.pdf
    • https://cdn.shopify.com/s/files/1/0434/6229/5714/files/pokime.pdf
    • https://cdn.shopify.com/s/files/1/0430/5872/5018/files/pawodibotota.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/acs_practice_exam.pdf
    • https://cdn.shopify.com/s/files/1/0459/1278/5045/files/angular_template_driven_form_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0469/0319/7856/files/rewapesakixuzeme.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_off000045e3.bin
be56293ad7d0583434b79a59ecb90470b73122bc0fd68ef4776e21b844a1f548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45E3 5564 bytes
font_01_sfnt_off000058f3.bin
1a30c18bbd400887a94f9a406f7aa59a32175a707415410afaa285d54527ea88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F3 9612 bytes

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