Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba66875fd6442dea…

MALICIOUS

PDF

37.3 KB Created: 2020-08-31 01:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d41dbd34c5fa0eacb75ddb1b4f5f957d SHA-1: 9606861786bbe8a83b6107fc0e261961fb2e7c98 SHA-256: ba66875fd6442deadf0866b16a3ac916af818385bf1fed5c81544c792a864ea4
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to a music sheet. The presence of numerous links to Shopify PDFs, some of which are benign, suggests a link farm or SEO poisoning tactic to mask the malicious redirector. No scripts were extracted, limiting the analysis of direct payload execution.

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.me/wix?keyword=bi%25E1%25BB%2583n+t%25C3%25ACnh+music+sheet
    • https://cdn.shopify.com/s/files/1/0437/7234/6526/files/23342363939.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/24412492865.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/kavekebimodezigapofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/0767/9387/files/51124057650.pdf
    • https://cdn.shopify.com/s/files/1/0434/0432/9127/files/loxomematoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3399/files/84304262864.pdf
    • https://cdn.shopify.com/s/files/1/0433/4541/2261/files/free_download_converter_to_word_nitro.pdf
    • https://cdn.shopify.com/s/files/1/0433/9594/0503/files/47899727079.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/95495659801.pdf
    • https://cdn.shopify.com/s/files/1/0434/0360/8214/files/wiwuli.pdf
    • https://cdn.shopify.com/s/files/1/0437/9138/4736/files/binuzetomonarit.pdf
    • https://static.usrfiles.com/ugd/63d3ad_b7f0b716581d4b4096b21f512aed7738.pdf
    • https://static.usrfiles.com/ugd/1f6d71_dd5e043bb4694861b06bdc4dc3f52bcf.pdf
    • https://static.usrfiles.com/ugd/b8c837_8642fb330a784758b48b2f0409f352f2.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_off000053fb.bin
d3e6c9443c1ffcd37773a893b31c7b74bf0122b2df0f43199daad3dee893516b
pdf-font-stream PDF embedded font (sfnt) at offset 0x53FB 5012 bytes
font_01_sfnt_off000064a8.bin
444f938734484b8de463cd04e0de13ef9e943e37ba9bdce8df658945ff935857
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A8 10012 bytes