Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f43a05e6dc6816e…

MALICIOUS

PDF

40.5 KB Created: 2020-08-09 23:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a1538dfe1601474a77ba8c7aae82202 SHA-1: 6ba72229dc266775b8f28064144680ed4f8bb12c SHA-256: 6f43a05e6dc6816e4e9096bfa4f06f6e117cb9ff44b25615781188c164b78dd4
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.com/pify?keyword=personal+financial+statement+template+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into downloading further malicious content or visiting a compromised site. The ML classifier strongly indicates maliciousness, and the presence of a link farm further supports a malicious intent.

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/pify?keyword=personal+financial+statement+template+pdf
    • http://files.poplarbluffdancestudio.com/uploads/1/3/1/4/131406036/buvugugiz_zugotap.pdf
    • http://files.aitcbroome.org/uploads/1/3/2/6/132681426/5436010.pdf
    • http://radabe.cyprusmediacenter.org/uploads/1/3/2/6/132683014/7e9d2e04a7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/short_rest_dnd.pdf
    • https://cdn.shopify.com/s/files/1/0431/2816/0420/files/68296725111.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/vufirusujisexadodi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/suramagufumaxuragozud.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5987/files/berojatatirepaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/2830/6341/files/71702948250.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/tubuxisitelusudibudutido.pdf
    • https://cdn.shopify.com/s/files/1/0438/8972/1496/files/reliability_theory_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sovonuvebapade.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7319/files/16188735947.pdf
    • https://cdn.shopify.com/s/files/1/0433/3161/6923/files/zalikosuwonag.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/114378906.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_off00006062.bin
eeeca00787cea9157d9f793619dd3a64a20ef42416caa0d7b1a1afcf384e59ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x6062 5300 bytes
font_01_sfnt_off00007253.bin
53fcfd08f242677a15a3d3f50c1444eea82313e5c80712489d2a0ae081d56337
pdf-font-stream PDF embedded font (sfnt) at offset 0x7253 10176 bytes