Malicious PDF — malware analysis report

Static analysis result for SHA-256 a389fad00d9771c9…

MALICIOUS

PDF

42.4 KB Created: 2020-08-15 02:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05070a315f0bb735fe632339d8bf8101 SHA-1: e7fd6b2c2dcbc602dc6e0fd3445d6c05a008aaaf SHA-256: a389fad00d9771c93981d93f0069d53a93ec7aa706d1a73b8f08f1a72decdcb1
150 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 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL and mentions 'Halloween worksheets grade 3', suggesting a lure. The presence of a large number of external links, many hosted on shopify.com, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the final destination.

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=halloween+worksheets+grade+3
    • http://bopuma.greatharvestclackamas.com/uploads/1/3/2/8/132814930/6752544.pdf
    • https://cdn.shopify.com/s/files/1/0440/7685/9544/files/coming_soon_website_template_html5_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1322/6143/files/63890785188.pdf
    • https://cdn.shopify.com/s/files/1/0432/3282/1412/files/break_even_analysis_cost_accounting.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/tabepesiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kesazemoluvumexon.pdf
    • https://cdn.shopify.com/s/files/1/0430/7491/2410/files/kepobefatoriruber.pdf
    • https://cdn.shopify.com/s/files/1/0433/7801/6406/files/denon_avr_x1500h_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3023/9637/files/socialismo_comunismo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7614/files/45983301444.pdf
    • https://cdn.shopify.com/s/files/1/0437/6903/6962/files/48081279649.pdf
    • https://cdn.shopify.com/s/files/1/0435/5984/6051/files/aci_sp_4.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/fijufu.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_off00006819.bin
644ef978e69d6fdebf111f3415ab4a86e62c6c0ce3d139b49ba22bbded20131a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6819 5368 bytes
font_01_sfnt_off00007a66.bin
b06779311129bb86d53e4850247f71dba6abb59bbed27f6b0a3cb0a40b0c689b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A66 10088 bytes

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