Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c8cde6bef8262f…

MALICIOUS

PDF

70.6 KB Created: 2020-08-30 15:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cad316651a788d12e9d23e80964e8b3 SHA-1: 1fa74e0d52ad934864a21306934d63063afcd26b SHA-256: 37c8cde6bef8262fd48bff63c5fd4767f8523c0cc769148e65aa307eb49c4b91
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. Additionally, it exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files. The presence of a visual download button lure further supports the malicious intent. The primary malicious IOC is the redirector URL, which likely serves as the initial step in a multi-stage attack.

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=open+cities+se
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/alphabtisation_en_cte_d_ivoire.pdf
    • https://cdn.shopify.com/s/files/1/0438/5626/5376/files/79132248943.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0328/files/19167510219.pdf
    • https://cdn.shopify.com/s/files/1/0437/5399/6442/files/foundation_design_principles_and_practices_solution_manual.pdf
    • https://static.usrfiles.com/ugd/a86d68_f6e743535aae40f1b93d3bfe71b768e3.pdf
    • https://static.usrfiles.com/ugd/80bfa9_e7d6802f07574c62a0a4a3e5e37e5ef1.pdf
    • https://static.usrfiles.com/ugd/b8c837_43940db074194fada2b71d292d73fb8a.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6282/files/nupapanotixazimidupu.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/winokanuxezetiviminotonus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9950/files/nrc_assam_status_report.pdf
    • https://cdn.shopify.com/s/files/1/0430/8982/1845/files/zewudidapa.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_off0000d9e7.bin
c6c4da8ec06626deff85caefbca32bd2666d1e778fc9ccac05d517cd8483fc26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E7 4616 bytes
font_01_sfnt_off0000e9b1.bin
92d963ea4d651e6687583a7a77d83e86a447b946fdaae93e2c71acdd635bf260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B1 10648 bytes

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