Malicious PDF — malware analysis report

Static analysis result for SHA-256 935c524748912b9e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-30 22:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b83ff77f8956423bc897b0333ce0cf4a SHA-1: d8248f64b9b1620f137318c2dc2dbfbe56e28e4f SHA-256: 935c524748912b9e37887df9bf99d4d9fd560ebae4ecc4b188441a8e0866fe18
180 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with many links pointing to static.usrfiles.com. One critical heuristic indicates the PDF links to a known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=pki+for+dummies+pdf'. Another heuristic flags the document for requesting recovery secrets, private keys, or backup codes, suggesting a phishing or social engineering attempt. No scripts were extracted from this sample.

Heuristics 4

  • 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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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/wix?keyword=pki+for+dummies+pdf
    • https://tisiphone.net/2018/03/07/the-infosec-amnesty-qa/
    • https://static.usrfiles.com/ugd/a18aa6_781d70c4b80048bebabc6276b487242e.pdf
    • https://static.usrfiles.com/ugd/4c1554_0f3750bffa4146198b88684be06fb395.pdf
    • https://static.usrfiles.com/ugd/b8c837_189ad59eae1f4411ac9b7abda0c0600d.pdf
    • https://static.usrfiles.com/ugd/83b1b3_8c775538784641a5902cad29dc805ff2.pdf
    • https://static.usrfiles.com/ugd/9d869b_f8936ae43a644e89bfd47e86708f6bfe.pdf
    • https://static.usrfiles.com/ugd/cdb50c_33174c625676461c8d37afd004a3d1f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad839648952a4f50aded2fd2e65d4f8a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f776add4ca840e09c28e0fbe21611d0.pdf
    • https://cdn.shopify.com/s/files/1/0437/5671/6186/files/jagokesonizisujuvo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1575/6181/files/silent_hill_2_greatest_hits_iso.pdf
    • https://static.usrfiles.com/ugd/b8c837_4655a326cd484d3082b8df47b7d8b63f.pdf
    • https://static.usrfiles.com/ugd/b8c837_15e9eb2a86294556bd47030af114e33a.pdf
    • https://static.usrfiles.com/ugd/856cea_43de77be1ae74d8aa7924525ef105b80.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_off00006936.bin
09eb3c4112ac88f5f80a5ff23d600c748c1bbd919dad0352924c9a18f6aa16e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6936 5008 bytes
font_01_sfnt_off00007a2d.bin
5eee72e1d76c9568f17f21aa59248c7139d68dd2286628872fd4fb065b73a0b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A2D 10192 bytes

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