Malicious PDF — malware analysis report

Static analysis result for SHA-256 edd0815bc9fcec13…

MALICIOUS

PDF

42.5 KB Created: 2020-09-05 06:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00287706778a15016f26c683dea7fc0c SHA-1: 1494ba5a656940d98d4f29bfdb4e43850fd914a9 SHA-256: edd0815bc9fcec13eafe5ed20be2701f5ba487504766862962fc7bbaaa5dc880
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic firing indicates a malicious redirector link, specifically 'https://ttraff.cc/wix?keyword=davis+drug+guide+ferrous+sulfate', which is known to lead to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. The document body appears to be obfuscated or corrupted, but the presence of the malicious URL is sufficient evidence for the attack pattern.

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/wix?keyword=davis+drug+guide+ferrous+sulfate
    • https://static.usrfiles.com/ugd/7e6083_20ca5905b7e142519eb11de100baf1f8.pdf
    • https://static.usrfiles.com/ugd/895bef_fb7c17422cbf465ab1bca9f1729a160c.pdf
    • https://static.usrfiles.com/ugd/a2ebd8_04d25ec2847144969b72311155d9987c.pdf
    • https://static.usrfiles.com/ugd/45fd81_22363a1279344191b797763c78f9507e.pdf
    • https://static.usrfiles.com/ugd/0c268c_7614b54bdbf04eb38bd4d3d99ed775ce.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/double_digit_addition_worksheets_free_printable.pdf
    • https://cdn.shopify.com/s/files/1/0440/2970/6390/files/sokapinafusuwarunepilu.pdf
    • https://cdn.shopify.com/s/files/1/0439/3598/9928/files/82717566332.pdf
    • https://cdn.shopify.com/s/files/1/0428/7270/1095/files/raxadimiladusexatopame.pdf
    • https://cdn.shopify.com/s/files/1/0433/9472/8103/files/german_literature_books_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/7977/7945/files/22_jump_street_full_movie.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/22713399317.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_off000067e0.bin
d73e1e9dbcada1224e2ccbb498fc917e7e226ab670e10c2685a6f85700d16298		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67E0 5136 bytes
font_01_sfnt_off00007977.bin
1422d3da3e82ca03f62ad411869a7e8f9b690cffd863634e1669858585906fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7977 10604 bytes

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