Malicious PDF — malware analysis report

Static analysis result for SHA-256 911fa90b797d79b3…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 05:11:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fc248a6a9ad2ca4da8859a589d26a15 SHA-1: 111c3e564192afc7f83053fec5329592c215bc21 SHA-256: 911fa90b797d79b32ea8ab1287cef4b7caa1924f922328994b76a55b1e36add1
120 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://ttraff.cc/wix?keyword=subnautica+enzyme+42', is flagged as a 'PDF_MALICIOUS_REDIRECTOR_LINK'. The document body, though heavily obfuscated, contains references to this malicious URL, suggesting the primary intent is to redirect users to potentially harmful content. The file was generated by wkhtmltopdf, indicating it's likely a crafted document rather than a typical user-generated file.

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=subnautica+enzyme+42
    • https://static.usrfiles.com/ugd/455f95_03f8126e18d34cbfa5e05ee83a88b6fb.pdf
    • https://static.usrfiles.com/ugd/9c43ec_ecb787856ce142baac345064a1135bb1.pdf
    • https://static.usrfiles.com/ugd/9904c2_cb9d9b05e21943df964dafbe7d087e12.pdf
    • https://static.usrfiles.com/ugd/b6edda_908b85bf11004dc4bdd3a40012aa049a.pdf
    • https://static.usrfiles.com/ugd/bf650e_47df1f3a55c04aa29895fbfcea64126c.pdf
    • https://cdn.shopify.com/s/files/1/0431/7485/4812/files/como_alinear_los_chakras.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/12220004715.pdf
    • https://cdn.shopify.com/s/files/1/0431/2875/0241/files/puriterurudibigupedam.pdf
    • https://cdn.shopify.com/s/files/1/0428/9599/9129/files/kowiponirugidoluvigaravu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/70838758317.pdf
    • https://static.usrfiles.com/ugd/b8c837_8aa6b8dff86a4d399fb9527455677dd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_e41261e3f39d47ac8a0695c7094588b7.pdf
    • https://static.usrfiles.com/ugd/d1c05f_67d30acf5a6943ba9ae03a370e4439ea.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/schizophrenia_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0438/5472/5270/files/intermediate_anecdotes_in_american_english.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_off0000560b.bin
f15857f53e409eecefc1f42c9f362dd4a24f18a3d343bbd36a54642235b65d4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x560B 5256 bytes
font_01_sfnt_off000067f2.bin
ebbd8b70d2c8bfd762f4912796c3c685a4e295e4c62c8816279198e1310d124f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F2 9920 bytes

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