Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c439cb0735a2aa…

MALICIOUS

PDF

36.4 KB Created: 2020-09-01 03:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acfe75788414619513451c24e7edb696 SHA-1: 6958e94a7b83a83187d994359a574e0f75e83d1e SHA-256: 50c439cb0735a2aa29963d53268c6a82c4278706fce8c0c8fe0cd63544eb56a4
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=world+of+darkness+bygone+bestiary+pdf'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many of which point to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary intent is to redirect the user to a potentially harmful site.

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=world+of+darkness+bygone+bestiary+pdf
    • https://static.usrfiles.com/ugd/3bcfef_7f267307eecb4c8b88e03e8a1aea788b.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_203d347f43c04cac88c2a7a6acec26b9.pdf
    • https://static.usrfiles.com/ugd/a382ee_8ba6268df71b4a80b9a28a3ee1f26a08.pdf
    • https://static.usrfiles.com/ugd/4d935e_6e4af42724294db4bcd75041d1e54024.pdf
    • https://cdn.shopify.com/s/files/1/0443/8307/6518/files/32975394863.pdf
    • https://cdn.shopify.com/s/files/1/0437/7808/0925/files/htaccess_cache_control.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/79045749775.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3770/files/nesugoliwoduzejixi.pdf
    • https://static.usrfiles.com/ugd/7ff653_14dff6ba5cf646588a7ce8c115e10ea1.pdf
    • https://static.usrfiles.com/ugd/a474dd_232231ccc07245d286bda7439bdc3238.pdf
    • https://static.usrfiles.com/ugd/77d535_5cafb717181542d897d29a80e4e36352.pdf
    • https://static.usrfiles.com/ugd/96768c_b723fd7b9a864a4e82500c6914c7e5f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_f1fb51ce81404a3294fb1828f2d667ca.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_off00004f72.bin
763711b4df2c721223693cc2cd4c9957be31da2c43b3a3b5f841d90b396bc01f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F72 5528 bytes
font_01_sfnt_off00006261.bin
70bd527a6c06747e1d97ea5fa19ef11d3a91ed684091c3a6c62c70e4b3d65121		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6261 10120 bytes

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