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) First seen: 2020-09-24
MD5: ea8194d57dd861dfa96457ccd6e22e24 SHA-1: bed9fd07d9e3c0fb0daf4c4eca68cb32b3b7e34a SHA-256: 8840b072219a96bda45cc84b66fc4e3204c7677459e81d7aff46b66c0a834bdb
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, many hosted on domains that appear to be part of a link farm. One URL, https://ttraff.ru/wb?keyword=cara%20resize%20pdf%20nitro%20pro%2010, is flagged as a malicious redirector. The document's structure and content suggest it is designed to manipulate search engine results or distribute further malicious content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 In PDF document text
    • http://files.megatronevents.com/uploads/1/3/2/7/132740700/fizowetorusu.pdfIn PDF document text
    • http://files.parashantiyoga.com/uploads/1/3/1/6/131636665/goxiso_xezapuguxaxo_sidiz.pdfIn PDF document text
    • http://files.orionavevannuys.com/uploads/1/3/2/6/132681281/55c0d5ea03634ba.pdfIn PDF document text
    • http://files.wcmmea.com/uploads/1/3/1/8/131856624/bomolofatelogumekuk.pdfIn PDF document text
    • http://files.hannahwilliamsdesign.com/uploads/1/3/2/7/132741433/lokajulafos.pdfIn PDF document text
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdfIn PDF document text
    • http://files.zamdevelopsj.org/uploads/1/3/1/1/131164534/7449164.pdfIn PDF document text
    • http://files.enchantedboutiquemn.com/uploads/1/3/2/6/132682919/f1d6be.pdfIn PDF document text
    • http://files.puddletownknittersguild.com/uploads/1/3/1/0/131070485/zojitegurum.pdfIn PDF document text
    • http://files.sarabarati.com/uploads/1/3/1/0/131071289/b289ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://forifibavir.files.wordpress.com/2020/06/12949946001.pdfIn PDF document text
    • https://rojapeb.files.wordpress.com/2020/06/diwugi.pdfIn PDF document text
    • https://fijupuw.files.wordpress.com/2020/07/tavejenopopekabokobev.pdfIn PDF document text
    • https://vasoponox.files.wordpress.com/2020/06/nasozizotu.pdfIn PDF document text
    • https://pezotagufunu.files.wordpress.com/2020/06/40115446885.pdfIn PDF document text
    • https://vudanusoniga.files.wordpress.com/2020/07/rorinesejimuvubemejawa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/72438278193.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/86593634255.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rerisorajomowuba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/davunaxejapezuxipuwuwozom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/15897713771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DFA 5056 bytes
SHA-256: 7475f521f47ee012efbf7be6abf9c72195b7adc25bc1965c2ebac4a18e039b8f
font_01_sfnt_off00007f45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F45 13860 bytes
SHA-256: 56507f2e72e857256fdd69de5e240c2a37a78d98f4a15160aa524add82f9bbff