Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef097789ed08a2b1…

MALICIOUS

PDF

40.9 KB Created: 2020-08-20 15:12:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bfbd29c3069cc953c030b355c5f2779 SHA-1: 3e2112c9dd26845bae21f52c170032be1f4f1181 SHA-256: ef097789ed08a2b1212f31fb493b2eb73f9aeef65c5d18abb7988de422b13646
120 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=karel+challenges+answers'. The document body, though heavily obfuscated, also contains this URL and numerous other links, many hosted on Shopify, suggesting a link farm or redirection strategy. The primary intent appears to be directing users to malicious infrastructure under the guise of providing answers to 'Karel challenges'.

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.cc/pify?keyword=karel+challenges+answers
    • http://larap.judithmpiazza.com/uploads/1/3/1/4/131438860/pigesukujoletaba.pdf
    • http://files.sadahespiiproctor.com/uploads/1/3/0/9/130969628/pogidadidedijo.pdf
    • https://cdn.shopify.com/s/files/1/0430/8749/5321/files/87491704528.pdf
    • https://cdn.shopify.com/s/files/1/0435/5050/7163/files/abridged_prospectus.pdf
    • https://cdn.shopify.com/s/files/1/0431/1685/5453/files/jokaloki.pdf
    • https://cdn.shopify.com/s/files/1/0430/7674/7413/files/certificado_de_preparatoria.pdf
    • https://cdn.shopify.com/s/files/1/0437/1863/9765/files/nafufufez.pdf
    • https://cdn.shopify.com/s/files/1/0435/7187/1912/files/5220232614.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8077/files/mods_para_minecraft_1._4_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/9323/7665/files/36509347226.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/associated_gas_reinjection_act.pdf
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/duxebovo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5601/3205/files/christmas_cartoon_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/clasificacion_de_las_empresas_por_su_tamao.pdf
    • https://cdn.shopify.com/s/files/1/0430/5931/4841/files/48595561052.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_off0000564b.bin
ac355f9c1cdab4d804df5b19f4fd7b15104778cc59c095f273959f85b573edce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x564B 4672 bytes
font_01_sfnt_off00006624.bin
cfefcb39bfd13f1990fdb13d11b9116562bd33080b319c56335e83af2110e76b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6624 10172 bytes
font_02_sfnt_off000088d5.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D5 4324 bytes

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