Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d4945ccbfc052c…

MALICIOUS

PDF

35.1 KB Created: 2020-08-06 19:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcd26c3e24a182d70a2fa5675fb55218 SHA-1: 4efa5bba27c1af4f2e8d9114af71caf7ca151234 SHA-256: e7d4945ccbfc052c759c5a500d0d71c8bc325d20fc6584fd1087ab904631e48b
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including one pointing to a known malicious redirector at `https://ttraff.cc/wb?keyword=reducing%20fractions%206th%20grade%20worksheets`. This redirector likely leads to a malicious payload or phishing page. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of a large number of external PDF links further indicates a link farm used for SEO poisoning or to distribute malicious content.

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.cc/wb?keyword=reducing%20fractions%206th%20grade%20worksheets
    • http://bereva.smokymountaink9sports.com/uploads/1/3/0/7/130739415/jexugunixeraj.pdf
    • http://files.emmietaylorphoto.com/uploads/1/3/0/8/130873943/496386.pdf
    • http://files.joekieferart.com/uploads/1/3/1/3/131384663/9a21c.pdf
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/70734479840.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/small_converter_software_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3767/1075/files/needs_of_animals_worksheet_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/4563/3691/files/22412629163.pdf
    • https://cdn.shopify.com/s/files/1/0435/8687/9651/files/zebadasabogudavasiz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lofolevunukexus.pdf
    • https://cdn.shopify.com/s/files/1/0433/8014/6343/files/84279742894.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/giwolasixaguwiwakunefupi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8821/files/nimiwarutamizokegimide.pdf
    • https://cdn.shopify.com/s/files/1/0434/9915/9718/files/17497377823.pdf
    • https://cdn.shopify.com/s/files/1/0429/9050/2042/files/46989629387.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/management_case_study_sample.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_off00004b37.bin
e488eeadb2bd377c41087036cf342b5d75cc0dd2d3d5f8bfd316f39515036fee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B37 5568 bytes
font_01_sfnt_off00005e3a.bin
75afac3986a8e9a5dc6628f85a885ba2340103d9e545c7de5da42730f6151aad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3A 9728 bytes

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