Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d5376aabd7c9a7…

MALICIOUS

PDF

85.1 KB Created: 2020-08-30 01:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26f51aa1c23581dbef073ce683a24b53 SHA-1: 992fcfd03776aa316904e889ae2902f3ce9efd19 SHA-256: 67d5376aabd7c9a70f41c2c72a2183b7f9737bae7a34c0f16dc975c81d91dfec
154 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector identified in the heuristics. The presence of numerous links, including one to a malicious redirector, strongly suggests a phishing or scam campaign designed to lure users to malicious sites.

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.ru/wix?keyword=%25C4%2591%25C3%25B4+th%25E1%25BB%258B+v%25E1%25BA%25A1n+gi%25E1%25BB%259Bi+l%25C3%25A3o+t%25C3%25A0i+x%25E1%25BA%25BF+wikidich
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/299074_fbd2621881424e3da317461e4f66decd.pdf
    • https://static.usrfiles.com/ugd/b8c837_e7d1ee1b78a9442ca693c84e1bd26f27.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_f0032134d8e94d3889481b34b08b892e.pdf
    • https://static.usrfiles.com/ugd/b8c837_a91bbc8fbeca4c888860e15f476d2463.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1825/files/mukupogibozajujubipavoben.pdf
    • https://static.usrfiles.com/ugd/81d6a4_cb2101aac38d4612985f698631051b40.pdf
    • https://static.usrfiles.com/ugd/a44510_63f6dc97397044ee9b710920d3b80016.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3eeb3ced771494d89cdb5f217548af8.pdf
    • https://static.usrfiles.com/ugd/1c8c6c_f4d5c68ed514454d9e5908c5104ec6fc.pdf
    • https://static.usrfiles.com/ugd/3b7182_8c57057df4d24cc29b0c50f94dc1ee9f.pdf
    • https://static.usrfiles.com/ugd/90c678_30551f3507474da9b99d47ecc16df68c.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fd60e01f1a142b5b48206175ef0db4b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b18c0ffc66744c3c871f2457452c1d9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_12c9730f158f4cf8a19dbdd16aaebd1c.pdf
    • https://static.usrfiles.com/ugd/253000_86f54a8e570a43d28d70e8bd9cf400d8.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e0.bin
18920cb730f71942957e88a86ac1e30a1c9546c28a844548f4f103f8b2e8f1cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 3644 bytes
font_01_sfnt_off0000fffd.bin
54c487da6f02492aaf3faf9ff28dbedea5fdcdfb13abb724ccc0abd5b5cf2a9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFD 6336 bytes
font_02_sfnt_off000113c2.bin
378eb9ecd0dbf582445f228e52721b5ce72044acc1e10a5a52b29dd00b3b9c93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113C2 22992 bytes

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