Malicious PDF — malware analysis report

Static analysis result for SHA-256 f579d6e390700f7e…

MALICIOUS

PDF

38.9 KB Created: 2020-08-31 01:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13fadb138a2341e9b5848cc580787ad5 SHA-1: bf02fb3af43707a2bef5fc0798ba598dcade0486 SHA-256: f579d6e390700f7ea8643a30485bfcaeba01161a1c9285857452f393c7d06d14
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL, suggesting a lure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which point to benign content, likely to mask the malicious redirector. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this file.

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=bach+minuet+in+g+guitar+sheet+music
    • https://static.usrfiles.com/ugd/f3ecbe_0c0da80a6f5a448a8873384fb45b71f9.pdf
    • https://static.usrfiles.com/ugd/03ae60_3be21cbf8c8e4fdd82fd927e9d2b1410.pdf
    • https://static.usrfiles.com/ugd/b8c837_d46dfc5edf7f4833a626abf19ee6e198.pdf
    • https://static.usrfiles.com/ugd/f4de5e_c8749c249ae44dce924b017dced0b097.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ebabf572332487ba4a4f7712ca3cfcc.pdf
    • https://cdn.shopify.com/s/files/1/0433/2807/7992/files/mathematics_worksheets_for_grade_1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d22cdb9f5e104815a60ba5cfedbbd167.pdf
    • https://static.usrfiles.com/ugd/4725f1_948fd5a19b2a411786a396ce835d22c7.pdf
    • https://cdn.shopify.com/s/files/1/0439/4539/4331/files/ruvutubuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/jixasukizux.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_off00005a16.bin
bfcba1a82a0cdb440b44988f3810298cbb1c08bdc1fdf54e7cc19dd4bff4dd59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A16 5228 bytes
font_01_sfnt_off00006bb3.bin
1bb8155251d458ad83d06792cfe53632c2aec4ab5957b249844e08e967fbded1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB3 10392 bytes

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