Malicious PDF — malware analysis report

Static analysis result for SHA-256 1346413418d45577…

MALICIOUS

PDF

35.8 KB Created: 2020-08-03 09:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e47ccfa8fcf7410adfc2aad60af6759a SHA-1: d9572f8cccdd42ab08d4c3979938572e39b3e6e6 SHA-256: 1346413418d45577b7e8f7cdba5a0247252104bdf3452532a617afce3ef77413
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, suggesting a phishing or scam attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that is also present in the list of extracted URLs, reinforcing the redirection attempt.

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=surgical+recall+7th+edition+pdf
    • http://files.tequilausa.com/uploads/1/3/0/7/130739309/lotejowonafit.pdf
    • http://files.northeasternwomensrugby.com/uploads/1/3/0/9/130969576/7706053.pdf
    • http://files.joandcooper.com/uploads/1/3/0/7/130775970/30b05ba2759.pdf
    • http://files.mollyshappytrail.com/uploads/1/3/1/3/131379343/7917806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/3673/7699/files/how_to_flatten_a_list_in_python.pdf
    • https://cdn.shopify.com/s/files/1/0432/3026/5511/files/xamovirufo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0416/6297/files/gumemekikiwe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9019/0248/files/20990587855.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/tomuvasodedoj.pdf
    • https://cdn.shopify.com/s/files/1/0430/1111/3123/files/92135769171.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/fupafadojujogoto.pdf
    • https://cdn.shopify.com/s/files/1/0439/4044/6366/files/lindsey_stirling_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/rokaz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6159/9656/files/bunn_ultra_2_parts.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/bikodonapiligipogag.pdf
    • https://cdn.shopify.com/s/files/1/0435/4922/9220/files/wemovorosesukegaxuvide.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_off00004d9d.bin
e21090f6f4bd6a0b8e58cb73b5cf4b4ffe43857df7e24921e10a480a0436f11a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D9D 5424 bytes
font_01_sfnt_off00006015.bin
10192948fc9a000ce97fd8ca037a7e04a820440aad78100b4bb6da9e2039cf42
pdf-font-stream PDF embedded font (sfnt) at offset 0x6015 10016 bytes