Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff823fada47a8d79…

MALICIOUS

PDF

41.6 KB Created: 2020-08-29 20:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9e74c5369add84a533dc2c1d5cb274 SHA-1: 7e99dd570bc8adb2b72b2a5aaefc34e64ab59154 SHA-256: ff823fada47a8d79baac878e19e4b59c67415be18c345c70544bdf61f06099ad
152 Risk Score

Malware Insights

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

The PDF document was flagged by a critical heuristic for containing a malicious redirector link. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/wix?keyword=imamlar%25C4%25B1n+%25C3%25B6c%25C3%25BC+epub, which is associated with known malicious redirector infrastructure. The document body appears to be garbled, but the presence of the URL suggests a lure for users to click through to a malicious site.

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=imamlar%25C4%25B1n+%25C3%25B6c%25C3%25BC+epub
    • https://static.usrfiles.com/ugd/b8c837_b7b30d30360941fc9ee6229c55a5721d.pdf
    • https://static.usrfiles.com/ugd/b8c837_1089c6a8614948b79ff195f8fdd50e4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_35847d17ca634e0f92ce52dfb6e6f35f.pdf
    • https://static.usrfiles.com/ugd/b8c837_131b139a46394c5aaed18cd7a6a23c7e.pdf
    • https://cdn.shopify.com/s/files/1/0440/2325/1094/files/eliciting_sounds_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/6282/0005/files/gotitilene.pdf
    • https://static.usrfiles.com/ugd/b8c837_02fcd7a8c76540ff8357d32089e30245.pdf
    • https://static.usrfiles.com/ugd/b8c837_dc3a4bf614a94e6e851c34e062a6ec3f.pdf
    • https://static.usrfiles.com/ugd/b65acf_0055d09e305947c99462e5c411ecf073.pdf
    • https://static.usrfiles.com/ugd/77941b_53e9df41ec144c2ab7de740a1346f293.pdf
    • https://static.usrfiles.com/ugd/0d002d_430e726a166a4f0db601f4025f6739a6.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_off00006296.bin
1f1e134a340cb4e19150b477a2508f4ef5e1a104fee7d94058454a0d46337364
pdf-font-stream PDF embedded font (sfnt) at offset 0x6296 5268 bytes
font_01_sfnt_off000073d8.bin
0f208d363ba090311489aaf7cab284ea20c9d2c42c09e20b0791792a7d588afb
pdf-font-stream PDF embedded font (sfnt) at offset 0x73D8 11748 bytes