Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9e6fd36c9020fc…

MALICIOUS

PDF

62.4 KB Created: 2020-08-31 10:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 013aec73770c620100e14f1359ff9202 SHA-1: 5ce16eb24bdbcba431f88bd0cd8a19b86e06c02e SHA-256: 9a9e6fd36c9020fc13cd4bf44af53f0532e8e825972863aec80cc4f84b5f6a52
150 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malicious redirector and part of a link farm, designed to lead users to external content. The embedded URL, 'https://ttraff.me/wix?keyword=employee+personal+reason+resignation+letter+sample', is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to employee resignation, suggesting a social engineering lure. The ML classifier strongly flags this PDF as malicious.

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.me/wix?keyword=employee+personal+reason+resignation+letter+sample
    • https://cdn.shopify.com/s/files/1/0435/5093/3156/files/katoset.pdf
    • https://cdn.shopify.com/s/files/1/0434/9768/5157/files/64489019610.pdf
    • https://cdn.shopify.com/s/files/1/0430/9539/2409/files/avast_antivirus_for_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0430/8733/1481/files/liberalisme_dalam_hubungan_internasional.pdf
    • https://cdn.shopify.com/s/files/1/0429/6769/5509/files/17128839195.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e1e337cd6fd4260911a757f1980cbd0.pdf
    • https://static.usrfiles.com/ugd/b8c837_40fac45572904770b6423b61e4f8c578.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/tamolidajetewased.pdf
    • https://cdn.shopify.com/s/files/1/0435/7259/2801/files/87497177124.pdf
    • https://cdn.shopify.com/s/files/1/0433/4488/7963/files/wuremulijekuvelidabef.pdf
    • https://cdn.shopify.com/s/files/1/0433/8515/9843/files/diferencia_entre_proceso_artesanal_e_industrial.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0818/files/50771518616.pdf
    • https://cdn.shopify.com/s/files/1/0432/6581/8789/files/fixajeduzutosejoxan.pdf
    • https://cdn.shopify.com/s/files/1/0435/7344/4767/files/22947283017.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_off0000b75d.bin
65a281a4f883b47204d77206ea319f0e15b83f7cbc8cdd9889805954e4b66074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB75D 5200 bytes
font_01_sfnt_off0000c902.bin
a9bf833dfc42be3971001a01d2247ff3680c5a95e99232918af976db75709e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC902 10464 bytes

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