Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3aa69af5bdc1dac…

MALICIOUS

PDF

33.8 KB Created: 2020-08-30 15:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5491cd838d0aa0176b5cf019446ed2c SHA-1: 4d884dd92296bb7a7d1d78a0f60093b83c7a461e SHA-256: b3aa69af5bdc1dac0cdf136830b5434c515166dc8230781908733bd3ad457de5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating it points to a known malicious redirector. Additionally, PDF_SEO_LINK_FARM suggests a large number of external links, many pointing to static.usrfiles.com. The ML_NYX_PDF_MALICIOUS heuristic strongly supports the malicious classification. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a malicious site or download further malware.

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.cc/wix?keyword=the+deception+of+allah
    • https://static.usrfiles.com/ugd/b8c837_9af0223be4134b44aeaca6abddd61bdf.pdf
    • https://static.usrfiles.com/ugd/921909_a8fed641ae16495798ceb41d3a7ea6a1.pdf
    • https://static.usrfiles.com/ugd/b8c837_0db9ade3fb8a4bf696c58fb475f2e1d0.pdf
    • https://static.usrfiles.com/ugd/3826db_50dc47f9e0c84ed988603abf5b97d9c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_1ccfee43798348d884f3d93ebe55a7a2.pdf
    • https://static.usrfiles.com/ugd/d2751c_fab96d39de2644359920801b9aa0a7d1.pdf
    • https://static.usrfiles.com/ugd/c162b3_1eed4c0afab443fda9936ad8d3582da5.pdf
    • https://static.usrfiles.com/ugd/3f4b99_dc52cc050d874290aeafe50e61286e01.pdf
    • https://static.usrfiles.com/ugd/be19e1_174f8ccbf53741029a8723ea2c809ef9.pdf
    • https://static.usrfiles.com/ugd/4b874d_aae54dc62f744ef0a1f8ba38962c5a3e.pdf
    • https://static.usrfiles.com/ugd/b8c837_001f808e5be346c29c604315f1ed1e70.pdf
    • https://static.usrfiles.com/ugd/ae059d_e30f81df89604b379c1380397956f0ed.pdf
    • https://static.usrfiles.com/ugd/67f5f7_d492608ebfe44cd29f4be19991d9aa9f.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_off0000489c.bin
669fdf767d35ca12855a6a4779af151dc437e13bee5c666fc237d4f6e1af10fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x489C 4916 bytes
font_01_sfnt_off00005952.bin
73dcde56e7473f5e96a8d4b87357a885db76e0c1efe52c6024d9f1ad9fbbe154
pdf-font-stream PDF embedded font (sfnt) at offset 0x5952 9768 bytes