Malicious PDF — malware analysis report

Static analysis result for SHA-256 524921942164a4f3…

MALICIOUS

PDF

54.1 KB Created: 2020-08-28 23:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f0565470fe57379cb71760fdb36f9be SHA-1: 1cc7011e4a3b818bac0c02f0e4809ce4e493fc9a SHA-256: 524921942164a4f3f69f0ec766a3f8a6882d300f9c246acf11844ec7748b521b
120 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/wix?keyword=kristan+higgins+blue+heron+series'. This indicates an attempt to direct users to malicious infrastructure. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, suggesting a tactic to increase search engine visibility or distribute malicious content. The document body, though heavily obfuscated, contains the target URL, reinforcing the malicious intent.

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=kristan+higgins+blue+heron+series
    • https://cdn.shopify.com/s/files/1/0432/9222/9787/files/73510810404.pdf
    • https://cdn.shopify.com/s/files/1/0434/7117/5846/files/ncert_accountancy_class_11_depreciation_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/exercicios_analise_combinatoria_concursos.pdf
    • https://cdn.shopify.com/s/files/1/0448/2321/6285/files/6541241364.pdf
    • https://cdn.shopify.com/s/files/1/0457/7152/2214/files/android_layout_gradient_background_color.pdf
    • https://static.usrfiles.com/ugd/b8c837_b88d344323bb46cabc741122bd7c87af.pdf
    • https://static.usrfiles.com/ugd/b8c837_73340e03bf734e0db3ff44b49dbedbd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_107871a511b54473afb38051ef128d10.pdf
    • https://static.usrfiles.com/ugd/b8c837_04ba36cb25b14989b3ddd3fe3d2cb6fb.pdf
    • https://cdn.shopify.com/s/files/1/0437/3997/1738/files/articulo_cientifico_cancer_de_prostata.pdf
    • https://cdn.shopify.com/s/files/1/0444/5673/8983/files/boksmart_rugby.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/watovunafasepen.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/rigaduwede.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_off00008916.bin
a1d2cd2c80f86bc3fa86ee3bfc8f851109eef4932b8f864c61042037f0e66ecf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8916 4940 bytes
font_01_sfnt_off000099d3.bin
af457268316adc84419e2bad4035c79a4d10e49ab125ed97608bb3dbc40575a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99D3 10392 bytes
font_02_sfnt_off0000bd77.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD77 4324 bytes

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