Malicious PDF — malware analysis report

Static analysis result for SHA-256 84391534944d161d…

MALICIOUS

PDF

41.1 KB Created: 2020-08-29 23:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b29caf154b4a50ed39f989b2bf3da802 SHA-1: 389955530e5069009d6a2b587256e537a442f503 SHA-256: 84391534944d161da2d505d8cac7ea6702386c4de491b791374329a8d6693532
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a known malicious redirector, suggesting an attempt to lure users to a harmful site. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, a common tool for creating PDFs from web content, further supporting the idea that the links are the primary malicious component. No scripts were extracted from this sample.

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/wix?keyword=ser+como+el+rio+que+fluye+pdf
    • https://static.usrfiles.com/ugd/9219f8_6854c0d55d1b4d348e208cc898e70f13.pdf
    • https://static.usrfiles.com/ugd/b8c837_e4b728b8f34e4bc4b63c6ee87bb3e84a.pdf
    • https://static.usrfiles.com/ugd/b8c837_33ace708e8524835b9e9b6d815723726.pdf
    • https://cdn.shopify.com/s/files/1/0440/8085/7253/files/atomic_timeline.pdf
    • https://cdn.shopify.com/s/files/1/0437/5343/9383/files/6990722956.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/metro_pcs_ringtones._com.pdf
    • https://cdn.shopify.com/s/files/1/0467/9945/4359/files/finiwugan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/kapaxufala.pdf
    • https://static.usrfiles.com/ugd/b8c837_a75d2d016c50462fa806556b74d8bc4e.pdf
    • https://static.usrfiles.com/ugd/6c032c_69e2735df2a24b1d9bdfbb0936c02953.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3fe03b5f37441ef8720a6ec74cb2d99.pdf
    • https://static.usrfiles.com/ugd/289c5e_fea59d0b6b684b168155531ae243a306.pdf
    • https://static.usrfiles.com/ugd/b8c837_de1879afb99948e58721224126c2868c.pdf
    • https://static.usrfiles.com/ugd/409ca8_b1c12b985f2d4d3bb8c967cd3ab44d8a.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_off0000619f.bin
c243b9e40017c1c5f32490a51529d613022570687f1e110d38ee39612e17c219		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619F 5244 bytes
font_01_sfnt_off00007362.bin
de240a1678525ff1662b607233e2e3583fa8f77114009c6f8b1bf23ed90919f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7362 10784 bytes

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