Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8617e83d7ebe57c…

MALICIOUS

PDF

44.7 KB Created: 2020-08-20 21:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9832452b4be490846b013d57a87cd00e SHA-1: 6e8f538881757819c4cbc00931a94f5785b074b1 SHA-256: e8617e83d7ebe57c50458615a30c7233c910977b0267d5f896f7a3112740bdcc
150 Risk Score

Malware Insights

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

The PDF contains a link farm designed to lure users with search engine optimized content, specifically 'accounting 101 chapter 6 test answers'. The primary malicious link, https://ttraff.ru/pify?keyword=accounting+101+chapter+6+test+answers, redirects to further infrastructure. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings indicate it's a redirector and part of a link farm.

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=accounting+101+chapter+6+test+answers
    • http://files.filmaim.com/uploads/1/3/0/7/130740536/saxof_lizedi_joziso_xatiritudi.pdf
    • https://cdn.shopify.com/s/files/1/0440/8963/9077/files/88985113.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/68804357532.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/gexizijeko.pdf
    • https://cdn.shopify.com/s/files/1/0431/8386/6007/files/13842824921.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/64160899743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tufajotojitumawudawemir.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/dafuzalogarojirukadajen.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/twee_bestanden_samenvoegen.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1064/files/tefameje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xigidewepiwunabifaw.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047af.bin
ea750afc9055b9a9563afa351bc5818c6e103fa780b393077500b36e6b9ee76c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47AF 5592 bytes
font_01_sfnt_off00005abb.bin
fbdf2fcebe663b11e0b52c0e68fa1f3faf90c21458895cf0f7252941e5db6e42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ABB 21244 bytes
font_02_sfnt_off00007bb2.bin
22a5582e276d36441aba78ddc333319abcb402e7e1b881de3205f8942689ecdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB2 2076 bytes
font_03_sfnt_off000084af.bin
3ccea6a65b0a38d724cca0f9550375c4182d41ba49626d3a0b97524dcc4394ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84AF 9576 bytes

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