Malicious PDF — malware analysis report

Static analysis result for SHA-256 27481ce56c58f264…

MALICIOUS

PDF

66.6 KB Created: 2020-08-13 22:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01df4e32597994a7d04fc94394fe1fc2 SHA-1: 60ad7068e76d332b70d3e3bd1887b0f71c474639 SHA-256: 27481ce56c58f264dacd6e708e25828a98535737518135e67476bd65714f24f4
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.cc/pify?keyword=graphene+nanosheets+sigma+aldrich'. Another critical heuristic indicates a PDF link farm, with the first URL pointing to 'https://cdn.shopify.com/s/files/1/0427/6027/4087/files/kavojekadub.pdf'. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains keywords related to the embedded links, suggesting a lure.

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.cc/pify?keyword=graphene+nanosheets+sigma+aldrich
    • http://tasumos.jgmizrahi.com/uploads/1/3/1/4/131454415/nekagedefukopoda.pdf
    • http://files.soulsearchrecords.com/uploads/1/3/2/6/132683154/ravomot.pdf
    • http://files.themadisonchildhoodcancerfoundation.org/uploads/1/3/1/8/131871479/ripofajuba-kegor-walolodotavad.pdf
    • http://files.decaledinc.com/uploads/1/3/1/6/131606281/vuwawezituxok.pdf
    • http://sebosoru.thedragoncourt.org/uploads/1/3/1/3/131384201/803e812.pdf
    • https://cdn.shopify.com/s/files/1/0427/6027/4087/files/kavojekadub.pdf
    • https://cdn.shopify.com/s/files/1/0434/1858/3192/files/pefer.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/vimunovajajufetologokadef.pdf
    • https://cdn.shopify.com/s/files/1/0433/9128/7452/files/vugetifed.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/zijaronupuxopenurupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1967/2472/files/dudosowo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3264/8597/files/calligraphy_practice_sheets_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9540/9311/files/wufidemezotakori.pdf
    • https://cdn.shopify.com/s/files/1/0432/4864/8354/files/xamabukusejomokuvusuwazum.pdf
    • https://cdn.shopify.com/s/files/1/0428/5513/7447/files/12895398098.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/10924357234.pdf
    • https://cdn.shopify.com/s/files/1/0431/5702/9019/files/73238883987.pdf
    • https://cdn.shopify.com/s/files/1/0431/9186/1412/files/fudafetaxodojatukukaziz.pdf
    • https://cdn.shopify.com/s/files/1/0438/7130/5896/files/48910725009.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/confederacy_of_dunces_summary.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/
    • https://cdn.shopify.com/s/files/1/0440/57

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b67c.bin
8fa5fc47f1c4d577ade0a12cf104f8d2f5d8331d2d553a120b9eeba46afd7401		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB67C 6168 bytes
font_01_sfnt_off0000c61e.bin
fcf8beb26bfa6154dafe91c457a9686b507a63093380d203ca18a59d41e8444e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC61E 5520 bytes
font_02_sfnt_off0000d8b5.bin
e525be0f4185b7752a386e00323d35107330f1dfcf38bd0e37882936a7751bdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B5 10484 bytes

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