Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6b731fae958c874…

MALICIOUS

PDF

37.3 KB Created: 2020-09-02 07:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcbcdd3890a83f1c94621914d63cf493 SHA-1: f6ad37f007af214fc1c61ae91994b998d7a97e61 SHA-256: a6b731fae958c874b8c1118fabcf787d837c9fa556a95c20c887aa2329b15ed5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes text related to 'capital structure and firm performance thesis' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to harmful 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.me/wix?keyword=capital+structure+and+firm+performance+thesis
    • https://static.usrfiles.com/ugd/de3d83_91963737180148a6888a8c5e09093d6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_c60a33eac6584991969a75197cdb0190.pdf
    • https://static.usrfiles.com/ugd/2c8d66_2dbab77740ec41e5974de5009cd11370.pdf
    • https://static.usrfiles.com/ugd/ecd213_e96200cfd2154ee2b2d29a57415419e2.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/storyboard_template_pptx.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/sikafuteg.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2813/files/sufexuriniwaxo.pdf
    • https://static.usrfiles.com/ugd/9757e7_079df3650aae4b81be825a07c52a0b73.pdf
    • https://static.usrfiles.com/ugd/3bf302_28b53ca495ec4914a8f42e291bc9f3dd.pdf
    • https://static.usrfiles.com/ugd/73cb9e_435d7b617a6e43948c742d89fa7a07e6.pdf
    • https://static.usrfiles.com/ugd/269bb8_62532ffed46746ae83dcb7d4daf7ed02.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_off0000460b.bin
7f85542b3e88cceec7ea1646990ac45a547f2546bb0be046dc7d6de8fb2a75e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x460B 5300 bytes
font_01_sfnt_off000057df.bin
3bdc925dc2bae8577b3a412af73b23849a0dd43b61c6ff5e4855bea38ec40899
pdf-font-stream PDF embedded font (sfnt) at offset 0x57DF 10000 bytes
font_02_sfnt_off00007a14.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 4324 bytes