Malicious PDF — malware analysis report

Static analysis result for SHA-256 09809f12875daa35…

MALICIOUS

PDF

58.5 KB Created: 2020-08-03 18:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c1ebcfcd5c70e4861363fc257c1e601 SHA-1: 3c76cda5c278fb33ea84f684bc07d7e143b2baa0 SHA-256: 09809f12875daa359b20f275ddaeb46b8a71e479012e7fd009426974cfc442ee
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with the primary URL identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted, but the document body and heuristics point to a redirection-based attack.

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/pify?keyword=geometric+sequence+pdf
    • http://files.selfback.eu/uploads/1/3/1/3/131383651/zepujexasa_kokamoxa_nafurosavo_tosemowefiputuf.pdf
    • http://files.lihmsisters.org/uploads/1/3/0/9/130969695/muvovexese_teguvozafawiwej.pdf
    • http://files.themusicboxnj.com/uploads/1/3/1/4/131437984/76f05d11c325.pdf
    • http://files.kuwtjd.com/uploads/1/3/1/3/131379409/kutawuneje.pdf
    • http://files.stniniansdunfermline.org/uploads/1/3/2/6/132681713/2728a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/zaxurak.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/79972974495.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/dubozazatit.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0830/files/xisavew.pdf
    • https://cdn.shopify.com/s/files/1/0435/3271/4139/files/nakaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/5627/4339/files/what_is_a._db_file.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/nered.pdf
    • https://cdn.shopify.com/s/files/1/0434/6970/1280/files/36174511192.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/zalikobototunewopowolej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1935/3757/files/14765416511.pdf
    • https://cdn.shopify.com/s/files/1/0429/6992/3740/files/tazaxuwulufukojirovonev.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/81397135942.pdf
    • https://cdn.shopify.com/s/files/1/0432/4432/2978/files/tolojofodimutamagadema.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_off00008324.bin
4c86d1d69f5333fd06067b4e1020579880faf1f93cf0329aa8fe310698e98bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8324 5216 bytes
font_01_sfnt_off000094d3.bin
1bccdec7145341f3bcbabcb9e8fa0f24a7340dd84b3e8f8547496f27c0b5974a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94D3 15776 bytes
font_02_sfnt_off0000c706.bin
13d0ac74cd9bb9c27face1de55cfcb247f10398c24457f279aeaab235b7f89b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 16232 bytes

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