Malicious PDF — malware analysis report

Static analysis result for SHA-256 670168285e5a8b3c…

MALICIOUS

PDF

41.6 KB Created: 2020-08-31 04:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f42f8dbc0d243483a4bf0c0f8573f37 SHA-1: 264e19af2c983599709a9c4e8c1b4fbe8504a236 SHA-256: 670168285e5a8b3c4f0371fd34d2a923c7db9331de47b6e681c8c9fb085ccf11
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document was flagged by a machine learning classifier and heuristics indicating malicious redirector links and a link farm. The embedded document body contains a URL pointing to a known malicious redirector, suggesting an attempt to lure the user to a harmful site. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure strongly suggest a phishing or redirection attack.

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=velvet+underground+live+1969
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/f515ca_7625c435b4e94a4db0b2dfc8dfeee251.pdf
    • https://static.usrfiles.com/ugd/5cf23b_32ff7d19ff4e42ae906e90e975aac299.pdf
    • https://static.usrfiles.com/ugd/07625c_3d8eb4d777ac4244a482e6c0c5801ddc.pdf
    • https://static.usrfiles.com/ugd/d216cb_8313cb7668f54868859d32c1842f69c8.pdf
    • https://static.usrfiles.com/ugd/0c41e7_df1404291777458a9e4d78a8e867887b.pdf
    • https://static.usrfiles.com/ugd/a86d68_191eedeb5aab4b989764320cae306253.pdf
    • https://static.usrfiles.com/ugd/0df15e_2ef793a0d8fc4e4393dcbf4a2e2f96ea.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4423/files/90231971439.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/samsung_all_share.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6d999c51a34c7996ee9ac66540983d.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf52e3c9035c4fc5ba97cdc78f330aad.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ac85aa85a6c4456be04a1ff789b1937.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000663d.bin
d733266ec3eba27d85d732c1658018a5de5c72a5cfdc0dc95ea334f5b01c6113
pdf-font-stream PDF embedded font (sfnt) at offset 0x663D 4992 bytes
font_01_sfnt_off0000774f.bin
3343c3487d0b0c96c84ae65805a3933d66097a6c6e0379d6105696f0c2f45522
pdf-font-stream PDF embedded font (sfnt) at offset 0x774F 10100 bytes