Malicious PDF — malware analysis report

Static analysis result for SHA-256 8840b072219a96bd…

MALICIOUS

PDF

46.0 KB Created: 2020-07-10 20:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea8194d57dd861dfa96457ccd6e22e24 SHA-1: bed9fd07d9e3c0fb0daf4c4eca68cb32b3b7e34a SHA-256: 8840b072219a96bda45cc84b66fc4e3204c7677459e81d7aff46b66c0a834bdb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying a link to known malicious redirector infrastructure. The document body also contains a large number of URLs, many of which follow a pattern of being hosted on various file-sharing or personal domains, suggesting a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to redirect users to harmful sites.

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/wb?keyword=cara%20resize%20pdf%20nitro%20pro%2010
    • http://files.megatronevents.com/uploads/1/3/2/7/132740700/fizowetorusu.pdf
    • http://files.parashantiyoga.com/uploads/1/3/1/6/131636665/goxiso_xezapuguxaxo_sidiz.pdf
    • http://files.orionavevannuys.com/uploads/1/3/2/6/132681281/55c0d5ea03634ba.pdf
    • http://files.wcmmea.com/uploads/1/3/1/8/131856624/bomolofatelogumekuk.pdf
    • http://files.hannahwilliamsdesign.com/uploads/1/3/2/7/132741433/lokajulafos.pdf
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdf
    • http://files.zamdevelopsj.org/uploads/1/3/1/1/131164534/7449164.pdf
    • http://files.enchantedboutiquemn.com/uploads/1/3/2/6/132682919/f1d6be.pdf
    • http://files.puddletownknittersguild.com/uploads/1/3/1/0/131070485/zojitegurum.pdf
    • http://files.sarabarati.com/uploads/1/3/1/0/131071289/b289ac.pdf
    • https://forifibavir.files.wordpress.com/2020/06/12949946001.pdf
    • https://rojapeb.files.wordpress.com/2020/06/diwugi.pdf
    • https://fijupuw.files.wordpress.com/2020/07/tavejenopopekabokobev.pdf
    • https://vasoponox.files.wordpress.com/2020/06/nasozizotu.pdf
    • https://pezotagufunu.files.wordpress.com/2020/06/40115446885.pdf
    • https://vudanusoniga.files.wordpress.com/2020/07/rorinesejimuvubemejawa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/davunaxejapezuxipuwuwozom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/15897713771.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.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_off00006dfa.bin
7475f521f47ee012efbf7be6abf9c72195b7adc25bc1965c2ebac4a18e039b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 5056 bytes
font_01_sfnt_off00007f45.bin
56507f2e72e857256fdd69de5e240c2a37a78d98f4a15160aa524add82f9bbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F45 13860 bytes

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