Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb0d27563968c1d…

MALICIOUS

PDF

43.3 KB Created: 2020-08-31 13:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ccb8dfc71503b291ae53992528777524 SHA-1: c0b5e8fadf17507bbb1efee4e85b6906b29da7e9 SHA-256: bcb0d27563968c1d0158fdf92ea358ded2bb8db61f856e1775625a82287151fd
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous links to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same malicious URL and references to fonts, suggesting a lure to entice users to click the link. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/pify?keyword=baskerville+semibold+italic+font+free
    • https://static.usrfiles.com/ugd/b8c837_0059d019dd9447f2a0ece78b553d13f6.pdf
    • https://static.usrfiles.com/ugd/b8c837_29ffe30b108647d0a3a8c20d0ba16e14.pdf
    • https://static.usrfiles.com/ugd/b8c837_b34d500d95844267aa7a0fb2f1b9653a.pdf
    • https://static.usrfiles.com/ugd/b8c837_10ef68244060448abd7ba5d1a41ddbec.pdf
    • https://static.usrfiles.com/ugd/b8c837_a234725131204072be73204f96052323.pdf
    • https://static.usrfiles.com/ugd/0a0016_59454e5c580a4f86867f72c5d8a7a29e.pdf
    • https://static.usrfiles.com/ugd/79e5df_8ba808d014564ab98f37378b85d96c34.pdf
    • https://static.usrfiles.com/ugd/82e28d_429b306ee5924cb58863acf319e31582.pdf
    • https://static.usrfiles.com/ugd/f96b02_f111c96f49714fdca6985647c968da58.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75877947267.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/72859422527.pdf
    • https://cdn.shopify.com/s/files/1/0432/5369/4626/files/78752591918.pdf
    • https://static.usrfiles.com/ugd/e73fea_abb3fcf93e4d4c7b9c1392b47c6ee8c0.pdf
    • https://static.usrfiles.com/ugd/a474dd_a079daa0c3db472d83e1558e46c95fc8.pdf
    • https://static.usrfiles.com/ugd/529dbf_d2f6a28e684042329eb8c3a264afff83.pdf
    • https://static.usrfiles.com/ugd/de60da_b0b79ec0afcc47febb67635c1c53212f.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005283.bin
90f97d74957dd8bcb5ac9477e3966ac017e05963e89b41d9d21f0b8defc2ca99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5283 5480 bytes
font_01_sfnt_off0000651e.bin
f82ab70e504e9e0f38836394fa572e42c702b25a97ff483ce14964c2f94a0487		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651E 11244 bytes
font_02_sfnt_off00008af4.bin
e8051d68498e63029d7c34361d406bcd46815681d18da0e8952f0660ee027cca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF4 16084 bytes

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