Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac507b918f1919db…

MALICIOUS

PDF

41.5 KB Created: 2020-09-01 01:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07d6e29189a367e48366853a3da5d447 SHA-1: d577d124288c13c7a84695d4ee42c4318eae486f SHA-256: ac507b918f1919db3d5adaedad8ca211c500ef8966d395cda21753c2ed570e97
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely used to obscure the final destination of the malicious payload. The document body, though heavily obfuscated, contains text related to 'free template slide' and the URL itself, suggesting a social engineering lure. The presence of numerous external links, many pointing to static.usrfiles.com, indicates a link farm strategy, likely to improve search engine ranking and distribute the malicious content. The ML classifier 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.ru/wix?keyword=free+template+slide
    • https://static.usrfiles.com/ugd/5ecadc_9d839b85969b4f24a4ef55d21d54f9d3.pdf
    • https://static.usrfiles.com/ugd/724bd4_67fb7ccd6d50417c84af0479c490314d.pdf
    • https://static.usrfiles.com/ugd/b8c837_41d3e100d03a4617adf6ae15b23b07cc.pdf
    • https://static.usrfiles.com/ugd/ce5d00_81674c3fc19c41b395ecfca58143b08e.pdf
    • https://static.usrfiles.com/ugd/963627_58d19662e0464173aba74fa319a02200.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc094715d9b24a4fb7148df98740b45c.pdf
    • https://static.usrfiles.com/ugd/e32576_5eb777baeda549409b48596b68005b79.pdf
    • https://static.usrfiles.com/ugd/b5472a_e000c4cd84b44443b14cfb9d8d8cb6d1.pdf
    • https://static.usrfiles.com/ugd/909b15_81fc33eb497742ec9085cd9618a24a84.pdf
    • https://static.usrfiles.com/ugd/ecec20_97eea653a94a4275bab235ebfee5099d.pdf
    • https://static.usrfiles.com/ugd/3e9e83_2f111f98242c4c3fbeb773f0f915b260.pdf
    • https://static.usrfiles.com/ugd/b8c837_676b10df6a5a49e8b9d0f0192a7b4ade.pdf
    • https://static.usrfiles.com/ugd/1a89c8_b715da3c7023454290bc9e6c7257ecaf.pdf
    • https://static.usrfiles.com/ugd/83d902_eba808af22fd41b89f04dc331da5f9d0.pdf
    • https://static.usrfiles.com/ugd/b8c837_dca6ca4fdd294ad1afac36aad4b7c27e.pdf
    • https://static.usrfiles.com/ugd/469aea_5509721eefec4d01b47300632f23c726.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_off00006568.bin
691cf122c412e40f6bb58c539618e61950706b458602b324ccbcec467aac18a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 5060 bytes
font_01_sfnt_off0000767f.bin
6e37f827d79cce54eba38bcb849e99b5093185b20670b6d9be431bbf3299bbc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767F 10216 bytes

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