Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde089d3684a31c4…

MALICIOUS

PDF

42.5 KB Created: 2020-08-16 16:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fe51b4d9e10fa072de5aeae87065bdb SHA-1: a76b310cb718027e7057207b147630d517b11fe6 SHA-256: cde089d3684a31c47636226ecc7465c73f5b90562b75654b9ddac556d12a323f
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though heavily obfuscated, contains the phrase 'shaded and unshaded fractions worksheets pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a malicious redirector, and PDF_SEO_LINK_FARM indicates a large number of outbound links, typical of SEO poisoning or link farm abuse.

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.cc/pify?keyword=shaded+and+unshaded+fractions+worksheets+pdf
    • http://rujonomu.blakemoreart.com/uploads/1/3/1/4/131406427/wojimubaxexa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9552/3485/files/vetegukojuroreburowu.pdf
    • https://cdn.shopify.com/s/files/1/0439/4903/1592/files/similarities_between_language_acquisition_and_language_learning.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5885/files/biguxerofotidaxekos.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78649322563.pdf
    • https://cdn.shopify.com/s/files/1/0439/4529/6027/files/rudewu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3397/files/2075064860.pdf
    • https://cdn.shopify.com/s/files/1/0434/3876/8294/files/72507933740.pdf
    • https://cdn.shopify.com/s/files/1/0443/8809/0022/files/90164616221.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6516/files/agriculture_raisonne.pdf
    • https://cdn.shopify.com/s/files/1/0439/0692/4712/files/designing_brand_identity_5th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/34715359035.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000540f.bin
f33be7d1cc5e991eb29e29acfa6e8511e90a4f0cacd51e70bb6a5ccb98ef936f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540F 5472 bytes
font_01_sfnt_off000066ae.bin
456716bceb1bf1951dd0faad04d8d4a9e45143ac8119402b1589af412d57e215		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AE 9676 bytes
font_02_sfnt_off000087fb.bin
f6e0f4a25f18a144688c6b7f40519a5efc98c72643b9054f89526e396d9b459d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87FB 16144 bytes

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