Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3751b86ddb88769…

MALICIOUS

PDF

44.3 KB Created: 2020-09-02 19:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83646c5956fc5b3064c3a5458877aa93 SHA-1: 6ebb42ea58542370c40ceb47a6462e96b0a5601a SHA-256: f3751b86ddb88769f479b89377fbbb866a9140bf2a7617da7b48ecabc6dcf696
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, disguised as a monthly accomplishment report. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms this, and the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, likely for SEO poisoning or to host further malicious content. The SE_DOWNLOAD_BUTTON heuristic suggests a lure to encourage user interaction with the malicious link.

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.link/wix?keyword=sample+of+monthly+accomplishment+report+in+office
    • https://static.usrfiles.com/ugd/b8c837_00fd662ccaa04630affd15a124454021.pdf
    • https://static.usrfiles.com/ugd/f967ac_0c663bb5e96c4827ae7d6f3821013121.pdf
    • https://static.usrfiles.com/ugd/09c3c7_ef9c0d2f27cd485a8f4afb616588064e.pdf
    • https://static.usrfiles.com/ugd/cdb50c_8ff2821e8a824c8d9fbb5ad3e92cd98e.pdf
    • https://cdn.shopify.com/s/files/1/0435/3038/7607/files/similar_polygons_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9491/7799/files/marodakamovojom.pdf
    • https://cdn.shopify.com/s/files/1/0429/6625/3724/files/cfa_level_1_mock_exam_2020.pdf
    • https://cdn.shopify.com/s/files/1/0458/9643/3818/files/votewudomumavonulas.pdf
    • https://cdn.shopify.com/s/files/1/0431/8940/3810/files/54200689995.pdf
    • https://static.usrfiles.com/ugd/5ed537_62fec4d3da0e4bbab1cda8b2a138aed9.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e91a634fb4d42afa64c2b9967012a9c.pdf
    • https://static.usrfiles.com/ugd/83b1b3_cf15a2bf5d9249e9bf689c6806bc5ce2.pdf
    • https://static.usrfiles.com/ugd/9757e7_99982fb5bd764751a08be213ed18d489.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_off00006f7a.bin
f08185b20038e1add85b71f9aa8c48479f4217f2779eb71d8dfe92846f086c91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F7A 5460 bytes
font_01_sfnt_off000081eb.bin
1521cbb5f0be67f53080940407621241c76ee7db7432251c9fb8d77adf75acaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81EB 10132 bytes

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