Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfb4e67684507bf…

MALICIOUS

PDF

39.5 KB Created: 2020-09-12 02:17:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83a2c0593c2a5b5bbf8ba87e4d225719 SHA-1: e861e3cc659f6054fc4ba6adbd2e5903ded8b9cd SHA-256: 3cfb4e67684507bfba38b98980a50ca086cf0b92c69db0cf14a1aafb4ec1a709
128 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'thermodynamics chemistry notes pdf class 11'. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, suggesting a link farm or SEO poisoning attempt. The SE_DOWNLOAD_BUTTON heuristic further supports a lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/pify?keyword=thermodynamics+chemistry+notes+pdf+class+11
    • http://files.petrilloskaratecampus.com/uploads/1/3/0/8/130874567/revixofewijuj-sasipej.pdf
    • https://static.usrfiles.com/ugd/efc97f_68592571195f4a09acd9ccde8210a557.pdf
    • https://static.usrfiles.com/ugd/d954c5_3e9a882b422e46a39c1200b42b1531f2.pdf
    • https://static.usrfiles.com/ugd/2ddd39_27dbed65a8cf4fc18a031470ad652854.pdf
    • https://static.usrfiles.com/ugd/4fb05f_a6251ac73cf74716b7c28ebf007cdf9b.pdf
    • https://static.usrfiles.com/ugd/a2e20a_17c16e122b1f4932be6bc7cd4541ccb5.pdf
    • https://static.usrfiles.com/ugd/0d018b_7e3096b4d8464950b5890a8de0dc49b2.pdf
    • https://static.usrfiles.com/ugd/7c30af_344e4eacf55f4f968a73758660acdfee.pdf
    • https://static.usrfiles.com/ugd/954c8b_7f1144aefa6f43cd9deb8b6fbe70a95b.pdf
    • https://static.usrfiles.com/ugd/df73ab_e5d69bc5069a47d98f8b258014a71669.pdf
    • https://static.usrfiles.com/ugd/98e2de_c5eb6b2e13c24c3da32fd51eb0c54353.pdf
    • https://static.usrfiles.com/ugd/55cc32_e675174634f34744be6b585c7d57f93f.pdf
    • https://static.usrfiles.com/ugd/f459ea_42e7ff19db064929a7fad305f93e6fbf.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_off00005c33.bin
bc3a51e4ca5e94fb9926172a37de3017d749630ad3f57b593ee26ede941721e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C33 5500 bytes
font_01_sfnt_off00006ec7.bin
512987b93af659f682fe575ad831ca60d51ab4f027d049157245cdd095b52c82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EC7 10184 bytes

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