Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfedd001532dfd3…

MALICIOUS

PDF

40.8 KB Created: 2020-09-01 07:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 73996243a8ff8c631279f48acc8d3101 SHA-1: d2842eea6fdfbc290207d912f6d43bbd814cf173 SHA-256: 3cfedd001532dfd360475b3a242926c96d506b1179b387d80f44cc67ade57591
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link to 'ttraff.com' is flagged as a malicious redirector. The document body, though heavily obfuscated, contains the string 'Astrill apk iphone' and the malicious URL, suggesting a lure to download potentially malicious software. The presence of numerous PDF links, many generated with numeric slugs, indicates a link farm strategy to improve search engine ranking for specific keywords.

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.com/wix?keyword=astrill+apk+iphone
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/66546900058.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/python_fizzbuzz_one_line.pdf
    • https://cdn.shopify.com/s/files/1/0430/9535/9642/files/jijed.pdf
    • https://cdn.shopify.com/s/files/1/0462/1041/6793/files/dufopazijagon.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8705/files/78303614743.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_1fa08341ac6041f2922500779fe6766e.pdf
    • https://static.usrfiles.com/ugd/badafb_9b425328456b45aebdf2ec92f9c24855.pdf
    • https://static.usrfiles.com/ugd/87b9a8_7a3fc9b840cf483ea28cea9893a9922a.pdf
    • https://static.usrfiles.com/ugd/a59130_e3b06a35c4ec445e85b538144176d7d6.pdf
    • https://static.usrfiles.com/ugd/cf14a4_1f77888aedcb42f589117d49a0ecfbd8.pdf
    • https://static.usrfiles.com/ugd/e2c6c1_38f2702c4c254867b73da78ca7185913.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_1c59cf02fea34e95b0266b60c6cd3a09.pdf
    • https://cdn.shopify.com/s/files/1/0432/1925/5454/files/6645189180.pdf
    • https://cdn.shopify.com/s/files/1/0434/1540/4695/files/nautical_star_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0434/7959/7213/files/cie_1931_color_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/63391703515.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/82169229101.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_off00006353.bin
c95c455491328905105f81b8cf3183fe67b35aa50f8ce53f7a134325f2d31e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6353 4960 bytes
font_01_sfnt_off00007427.bin
f396a503d72dd01ec49a170f4bf7f739f863591e5b5566ccf4c3f9198fd8a51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7427 10072 bytes

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