Malicious PDF — malware analysis report

Static analysis result for SHA-256 d786dd6ad94ef431…

MALICIOUS

PDF

46.0 KB Created: 2020-08-14 03:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd87d55d5b9d83191bf8b9836116b1c3 SHA-1: d27a905dfde5e5354211f231780ac5e15cfb8069 SHA-256: d786dd6ad94ef431376336c75c4917a634d4a4f98c147717c845c345abcb8295
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that is disguised as a download for 'Bluestacks 4 apk'. This link points to ttraff.ru, which is known for malicious redirector infrastructure. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content. The ML classifier strongly flagged 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.ru/pify?keyword=bluestacks+4+apk+y%25C3%25BCkleme+hatas%25C4%25B1
    • http://files.harrisburghigh.org/uploads/1/3/1/3/131379371/d7ff44.pdf
    • http://dogumul.victoriaedgarr.com/uploads/1/3/0/8/130874493/7252725.pdf
    • http://files.tmsdrama.com/uploads/1/3/2/3/132303310/xuzafezigewilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/53493330654.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/22919731718.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/lekitumibonokug.pdf
    • https://cdn.shopify.com/s/files/1/0431/4618/2822/files/gajilutapusakomuzapamopil.pdf
    • https://cdn.shopify.com/s/files/1/0429/0953/2316/files/nozonejijumolepaboto.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rofan.pdf
    • https://cdn.shopify.com/s/files/1/0432/1555/2674/files/saratasu.pdf
    • https://cdn.shopify.com/s/files/1/0428/4094/8892/files/categorical_data_analysis_using_the_sas_system_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3296/0409/files/graphing_lines_in_slope_intercept_form_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2687/files/webogenemabagogo.pdf
    • https://cdn.shopify.com/s/files/1/0440/8243/0117/files/nirekovepujekab.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_off0000721d.bin
2004b7aa7905149523c50f224c05c968a85dc4288cafa661d01481cb31cee367		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 5532 bytes
font_01_sfnt_off000084b0.bin
61a59551cf72d0000e0584ce3bf760c3672a7033c33f01519bcd6724a700c169		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84B0 11796 bytes

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