Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7daa6e8a6a5017…

MALICIOUS

PDF

38.0 KB Created: 2020-08-30 19:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1e68420df55f7ddfae51d1c8872ff67 SHA-1: 441ab69247ccf43eb3ed60dc09beefa4d9e111f4 SHA-256: 3c7daa6e8a6a5017f9cb21d8ef46220e2acd7aa92d944f5c2b3b75d174d48077
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL points to a known malicious redirector, likely intended to lure users into downloading further malware or visiting phishing sites. The ML classifier also strongly indicated maliciousness.

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.com/wix?keyword=geometric+constructions+practice
    • https://cdn.shopify.com/s/files/1/0451/0813/4053/files/occupation_list_australia_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/6911/1448/files/ibpsguide_free_mock_test_sbi_clerk.pdf
    • https://cdn.shopify.com/s/files/1/0461/4337/3480/files/google_chrome_apk_for_computer.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/reported_speech_intermediate_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0435/1678/8900/files/vuwazobevuw.pdf
    • https://static.usrfiles.com/ugd/72b0e7_d6a9350671074490b1425dec777d7b50.pdf
    • https://static.usrfiles.com/ugd/5ed537_d1c67db892884442910dbd5a32532bbd.pdf
    • https://static.usrfiles.com/ugd/b8c837_90f3194e6bc64949924889cee6bf18be.pdf
    • https://static.usrfiles.com/ugd/1be480_43a0908a190441e99355b28933f9a2b4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b04b151de58545ecbe6dbab3f5d30991.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_46757da03c084911971a25e40e71924a.pdf
    • https://static.usrfiles.com/ugd/b8c837_778eadfd0cd3492fad1978ab6ba96529.pdf
    • https://static.usrfiles.com/ugd/ecec20_db219bf6e29945ef8adc763475e39570.pdf
    • https://static.usrfiles.com/ugd/b8c837_f451dc816fca4411af055875a0af53e9.pdf
    • https://static.usrfiles.com/ugd/affb4a_70aa3448dfb74841a67af05bbc7e65c7.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_off0000558c.bin
a5dec65cc02a5573f0579ded50639d2379ba1e4e2dee1aa5f5cd0c39ce1cd3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x558C 5080 bytes
font_01_sfnt_off000066be.bin
34b323cb97a0b49ee1bbd99f29ddaced76d6752d1aaa5d3df607b852bf395ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66BE 10648 bytes

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