Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7d82ed15262170…

MALICIOUS

PDF

64.5 KB Created: 2020-08-09 11:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3313549869e6924f65ff8ccaa488510e SHA-1: 7693e5518778d0c978cd89c52ca5eb9dbe4efe0a SHA-256: de7d82ed15262170e06c585708a7f9d8746000204dba6e62c846b1e8a02ef0e1
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly indicates maliciousness. The primary IOC is the malicious URL used in the redirector. The document appears to be a lure for a malicious website.

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=%25C3%25A9crits+apocryphes+chr%25C3%25A9tiens+pdf
    • http://zevisus.sharonlewis.net/uploads/1/3/0/8/130814229/4614231.pdf
    • http://files.letsrockandrollandchangetheworld.org/uploads/1/3/0/8/130814176/9aafb47.pdf
    • http://xuwawix.briarwoodcommunications.com/uploads/1/3/0/8/130873951/e1955d5e.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/58192947869.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/fowuwodefodukaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mavadusuwavofemikedoj.pdf
    • https://cdn.shopify.com/s/files/1/0435/1547/8176/files/jegulenevobarux.pdf
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/dabapagovegikuje.pdf
    • https://cdn.shopify.com/s/files/1/0434/5213/7622/files/94322488898.pdf
    • https://cdn.shopify.com/s/files/1/0439/1796/7528/files/87545817753.pdf
    • https://cdn.shopify.com/s/files/1/0432/2846/3271/files/emerson_microwave_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/9236/1887/files/kesusulozimanigogawaxaxo.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_off0000b81b.bin
22c95d975ca89bb2e6101e61f6f44430018efb52d7f58bfd62df642fb2916211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB81B 5436 bytes
font_01_sfnt_off0000ca5d.bin
8b2524a43b30fb21a61a5b712d3ae253c2bfc22d50b330c31876f02f3120ac57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 12928 bytes

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