Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfba6b0c6d55ad8c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-31 05:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1cf698538899a723911714d664d8e09 SHA-1: e2ee907d71b4340a5f2e42159855b1823c4aed3f SHA-256: bfba6b0c6d55ad8cdcf1f3494f42512cb66adb6c44846754d68665926bd42adb
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 'https://ttraff.cc/wix?keyword=died+in+house+free'. Additionally, it features a large number of embedded links, characteristic of a link farm, with many pointing to 'static.usrfiles.com'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a lure to external content.

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.cc/wix?keyword=died+in+house+free
    • https://static.usrfiles.com/ugd/1f6d71_45a7feb035644b94a9b07c9a962d69c8.pdf
    • https://static.usrfiles.com/ugd/906e9f_aaca89c430e04386a58bb5729c912f35.pdf
    • https://static.usrfiles.com/ugd/b8c837_5c21f3a9479542fc966c7fa7896050f6.pdf
    • https://static.usrfiles.com/ugd/a107db_83cffb2c78084d63b1dbfb217539f3ae.pdf
    • https://static.usrfiles.com/ugd/ee9d3f_34cb2e3c80f349e0bc22807a58a4402a.pdf
    • https://static.usrfiles.com/ugd/01e791_f790b2818bcb47bd8f5a5d3ceba4743d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f430eee9e9b442993b1fc04c3d562ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_55d976cb04a84082b6f311c67079b2d0.pdf
    • https://static.usrfiles.com/ugd/7baf93_2eb4895e017f4421b202b5dbdc1a13d5.pdf
    • https://cdn.shopify.com/s/files/1/0432/5654/5433/files/isometric_drawing_tutorial_autocad.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/matplotlib_3d_scatter.pdf
    • https://static.usrfiles.com/ugd/db93e9_7c15c9531edf4924a2343a9db72aa458.pdf
    • https://static.usrfiles.com/ugd/b8c837_38c9b5435ed4435ba27109d4595ac2ab.pdf
    • https://static.usrfiles.com/ugd/ab922d_bbd7f284d5da41f0a7781f5695c92b1a.pdf
    • https://static.usrfiles.com/ugd/b8c837_984aba8673e94f28b01643f7eb643778.pdf
    • https://static.usrfiles.com/ugd/d216cb_6af49aca3236434da39c290bb5942eda.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_off00006a67.bin
e0dd5cefcaee3765317f800c8978a1a182730a9781391a599c04f9a36c52f68f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A67 4752 bytes
font_01_sfnt_off00007a81.bin
b61e27be64905d4e419b658d3364fc455871c356fcea1469f5f254e025690613
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A81 10408 bytes