Malicious PDF — malware analysis report

Static analysis result for SHA-256 4082bd9b872bfb5e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-29 07:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ded1d647eaa6ec5df5c7cc7f9d2dc1a SHA-1: e8c7f4331c1118a87f71ec13345eb102f18132d8 SHA-256: 4082bd9b872bfb5e28d2580693e857cef124df7733bf655abc40b2a8f57d355d
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a PDF link farm. One of these links points to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, also contains the URL https://ttraff.com/wix?keyword=farewell+to+manzanar+shmoop, suggesting a lure or redirection mechanism. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=farewell+to+manzanar+shmoop
    • https://static.usrfiles.com/ugd/b8c837_47e7a86fa69c4d9eb9c52e1113801517.pdf
    • https://static.usrfiles.com/ugd/b8c837_889bbe83afd54d46bbfef5d9a3a0254c.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2c7ec019d1240dc8bf1d6f825b46b2f.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/76600042001.pdf
    • https://static.usrfiles.com/ugd/b8c837_2c30d319571043b181911b6d6f49b551.pdf
    • https://static.usrfiles.com/ugd/b8c837_a6bc3d5a78ca4cea9643cf91a17a9546.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce0492239dc14be7ba85c600cdf4dae1.pdf
    • https://static.usrfiles.com/ugd/b8c837_b89b70d13faa442ebdba2253dfcfa388.pdf
    • https://static.usrfiles.com/ugd/b8c837_c42e6703235b46b7b7d138508d0cc301.pdf
    • https://static.usrfiles.com/ugd/b8c837_e93bba4aaf294c8580a8d5815231a183.pdf
    • https://static.usrfiles.com/ugd/b8c837_91e22bda275a4488aca5667fd10a698b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4882addf254c45429f8ddd300ca1c29a.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
stream_005_off0000a169.bin
98021766eabafd9c1bcc31d7d1d1103a5dab53395f397f17d288c4da164be205
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA169 17788 bytes
font_00_sfnt_off00006d3f.bin
6c5c9c87a49f44e7438caf8f88e4b8a44fee1347c9ff85d43b3e80a9ca5f2961
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D3F 5156 bytes
font_01_sfnt_off00007eb5.bin
4318d8a5fbe99e942497a6935de1f4a5d6158b50d06d0f4772f4e598059f1e08
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 10076 bytes