Malicious PDF — malware analysis report

Static analysis result for SHA-256 4756e3413942d3bf…

MALICIOUS

PDF

32.6 KB Created: 2020-08-30 04:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a7d67d71da6cb99097e08cd9d6a7eb42 SHA-1: 92c5052dd017fc9463b9eb266930d01fc0861f92 SHA-256: 4756e3413942d3bf1797708b7b0d91daf1c6b6483e477272fabcf20d0f793724
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=bridge+to+terabithia+student+workboo'. This URL is embedded within the document body, disguised as a student workbook. The presence of numerous other links, many hosted on Shopify, suggests a link farm or SEO poisoning attempt to drive traffic to malicious destinations. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.club/wix?keyword=bridge+to+terabithia+student+workboo
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/70695308717.pdf
    • https://cdn.shopify.com/s/files/1/0430/9277/0977/files/tv_guide_tulsa.pdf
    • https://cdn.shopify.com/s/files/1/0436/3173/9033/files/xopegifuwuxomi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6954/7431/files/an_introduction_to_thermal_physics_schroeder.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/vijegipituzotezaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/9090740429.pdf
    • https://cdn.shopify.com/s/files/1/0428/8829/8662/files/email_sign_in_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/14066687283.pdf
    • https://static.usrfiles.com/ugd/8a419d_27bb382968bc4e05b42773aaf32ed56d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ac3c43eabc7466497d2b29eb1063d4c.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_off0000425a.bin
72940b7df5954736e15e0a47c709e3d5b12af9cc01d7fe41398986a55fb8f73c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x425A 5400 bytes
font_01_sfnt_off000054ba.bin
c35526f42e0dd6aaea1f24b44b5952d1fabb53180a14ba162d1969ec0df202a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54BA 9760 bytes

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