Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8eee6d271575324…

MALICIOUS

PDF

36.9 KB Created: 2020-08-30 08:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34749cd3647ea4d498f3362df4e639f6 SHA-1: 9db6e42011547ab13e6719fecc422f1da7cf61d3 SHA-256: b8eee6d271575324822bb5e6adfb05ed02d86297a1b3af991488505c7b121df7
152 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and contains a large number of embedded links to external PDF files, characteristic of a link farm. One of these links, https://ttraff.cc/wix?keyword=listening+total+insurance+incident+r, points to known malicious redirector infrastructure. The document body contains garbled text but includes the same malicious URL and several benign-looking URLs, suggesting a lure to redirect users to malicious 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=listening+total+insurance+incident+r
    • https://static.usrfiles.com/ugd/b8c837_dc9f49499aad4e9d969b7b51fc7e39d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_4598db8c43eb4f91b023d1bec901bbd3.pdf
    • https://static.usrfiles.com/ugd/ed64d2_fea8b1db63cb43489e5680b01d27e4b3.pdf
    • https://cdn.shopify.com/s/files/1/0462/7660/8160/files/sweet_bestie_selfie_camera_apk.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/asphyxial_death.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1155/files/chinese_calligraphy_practice_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/wevuvaraw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2449/0397/files/boxodejo.pdf
    • https://static.usrfiles.com/ugd/b8c837_6095cd605a4b43bca7bb6f59728d8c0f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a3598d9f81614114816d2769add7d672.pdf
    • https://static.usrfiles.com/ugd/73f3b0_0be41e5b3b384bd5ab4d213bba8feb3c.pdf
    • https://static.usrfiles.com/ugd/804ff6_ace6603d46bb4e3aa2f47c5a817b07da.pdf
    • https://static.usrfiles.com/ugd/91e123_fb7aa6d807a643a8a0ceb2d5c009fcd9.pdf
    • https://static.usrfiles.com/ugd/0d2908_6c6ce046c9ac4c2e83c48068f38ccc2f.pdf
    • https://static.usrfiles.com/ugd/5926b4_5b126fda7e8149c0afa01563a5548e19.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_off00005382.bin
b95eddb01792b92e9225f2c70e878c2a3030ffa564c52c7c57d2f1dd5bf3c18a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5382 5048 bytes
font_01_sfnt_off000064b3.bin
931d3dba53702b5bcc9298fb2ccdb64c1ff4e8364d41247c1dc4b8ce2fd4a5ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B3 10052 bytes