Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4fc95deaa64488…

MALICIOUS

PDF

54.1 KB Created: 2020-08-29 21:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9a7bcd0a2af331f3bc9cbbfdf4087cf SHA-1: 10ce2223db5fd5e031d96b52e893c76fe90d0bfc SHA-256: 2e4fc95deaa64488e0cca4a709c561fc8516c39cbf2683af621ffd879d7db1f6
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=formula+para+sacar+moles'. Additionally, it exhibits characteristics of a PDF link farm, embedding a large number of external links, with 'https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf' being one of the first identified. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and other links, suggesting a lure to external malicious content.

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.ru/wix?keyword=formula+para+sacar+moles
    • https://static.usrfiles.com/ugd/b8c837_c9f18cad06e041a6baedb4428c042c3d.pdf
    • https://static.usrfiles.com/ugd/0aab01_84bb08b89b334729a9c09bbd03aca3c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_8975f5a5e0a24ff2977e82b9764059af.pdf
    • https://static.usrfiles.com/ugd/a771bd_8b4c12df35c745cf85983b4c67b15eb5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7edd44ac085d4c6fa20bd1fb0a4a616f.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/control_de_calidad_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/51215760686.pdf
    • https://cdn.shopify.com/s/files/1/0438/2051/5488/files/nitilejeluwarorunew.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffa8688089a64fd181585a1459adc7e0.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_0e5ac4a8219547b48fe590888ecc9d61.pdf
    • https://static.usrfiles.com/ugd/b8c837_92c89f0ed4484e788e34c4f08e9f3aa5.pdf
    • https://static.usrfiles.com/ugd/b8c837_f69efc7993d64722bb3375252cf638f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_36b94304d93f40bca7dbe41b437efeb7.pdf
    • https://cdn.shopify.com/s/files/1/0430/9480/2581/files/marriage_contract_sample.pdf
    • https://cdn.shopify.com/s/files/1/0435/3264/8602/files/branches_of_science_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/19288986090.pdf
    • https://cdn.shopify.com/s/files/1/0428/9187/0375/files/netosuludalobuperilowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/datupawibepoxilos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ef.bin
b7f039b7c3996c5153b5818aff99d4fbad2fa47fa74a843824753987f18a515c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EF 4680 bytes
font_01_sfnt_off000091cb.bin
739e2e1df3ab7ba7c88cf561b9ef427c6a5c3d824cc25ea76a78aae480b26b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91CB 13676 bytes
font_02_sfnt_off0000bcec.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCEC 4324 bytes

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