Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4acc41f969f037…

MALICIOUS

PDF

37.8 KB Created: 2020-08-21 15:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4772cb2159c9183f95061266c42f2db5 SHA-1: 426938e27baf4d573762f479541fbc11777a999a SHA-256: 0d4acc41f969f0371ed19e30e027bbe941d1714e2813e2ab0880f90a0a19270e
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains text related to sheet music and the malicious URL, suggesting a lure to a phishing or scam site. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external links indicates a link farm or redirection strategy.

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/pify?keyword=la+la+land+epilogue+flute+sheet+music
    • http://files.aatuners.com/uploads/1/3/2/6/132695915/koxojalato.pdf
    • http://files.oldetownesalisburymd.com/uploads/1/3/0/7/130738892/6257385.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7557/5703/files/36338473198.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/free_usps_change_of_address_form.pdf
    • https://cdn.shopify.com/s/files/1/0434/6268/8918/files/que_es_apriorismo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5720/8731/files/62227396582.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/3186157934.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/care_super_insurance_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/4038/1855/files/vuretedafedud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8414/5049/files/nigoximuzevozevivu.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_off00005872.bin
dca76c34f354f3a544fc46302e18da7bdcf6f3c31378b7e63f1fdaeb78c2eb12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5872 5416 bytes
font_01_sfnt_off00006abb.bin
436f0fef1d39e5a08640a6ec11c05ba18c247e6e24226b913c6ee84868c6d5bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ABB 9376 bytes

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