Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efb8fce7abf721a…

MALICIOUS

PDF

47.2 KB Created: 2020-09-01 22:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8372fc6dc6d3c85054503812063b1d33 SHA-1: 0865ff36aed0f32c21a4f9384688f56276dbd80e SHA-256: 4efb8fce7abf721a74196fec7483ba3894b0145346c8de6bbbd1b2cd674c5ff6
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and keywords suggesting an attempt to disguise malicious content as academic material. The primary attack vector appears to be directing users to malicious infrastructure via these links.

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=clinical+veterinary+microbiology+pdf
    • https://static.usrfiles.com/ugd/41a0b6_cdc9ddffaffe41f18c7dba59640d2e84.pdf
    • https://static.usrfiles.com/ugd/c7a620_e2608ace98b049629e8ad558fca74457.pdf
    • https://static.usrfiles.com/ugd/784815_62493406c9ad4f559c046af788041d8c.pdf
    • https://cdn.shopify.com/s/files/1/0428/5143/4659/files/46922591359.pdf
    • https://static.usrfiles.com/ugd/ce0e6d_daef7adf949847ab9c4756c2bcc1e049.pdf
    • https://static.usrfiles.com/ugd/dc98cc_816aa1830a404254a31554d39ce429e8.pdf
    • https://static.usrfiles.com/ugd/2e4eb4_0db2e7a708ef4907a12c7dc0ac40653b.pdf
    • https://static.usrfiles.com/ugd/36f25b_7f287c2a1cad4c6e8375743b3b5bf70a.pdf
    • https://static.usrfiles.com/ugd/cec570_ae96257bd74344498ec04b182eeddadf.pdf
    • https://static.usrfiles.com/ugd/88a84f_1d7be04926f44a5599e82e906ddd5dc8.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_off0000794b.bin
524684acf4d7030cc97118207fe4a12dedf23b867661e80f48478e10a8d46867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 5504 bytes
font_01_sfnt_off00008bfc.bin
800715c3971a86ee4b374f9be16ef0c829a5b028e953f67df15733102a2da6f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFC 10636 bytes

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