Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebfd1e2088de571a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-29 01:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d835cec2dd7dca0e372f400c54f723d9 SHA-1: 2d64c37586f7194467b1910adb70ecc3cd373396 SHA-256: ebfd1e2088de571a221d8246ed2492266a065b82ef7378ca85753117741e03ce
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing indicating a link to known malicious redirector infrastructure. Additionally, another critical heuristic identified it as a PDF link farm, suggesting a broad distribution attempt. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the malicious redirector URL, which is likely the initial lure.

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=awards+manual+flashcards
    • https://static.usrfiles.com/ugd/b8c837_b9014f6f1a234e708e17ecb817c429d1.pdf
    • https://static.usrfiles.com/ugd/b8c837_70871d3d0f7e48c7a2680046aef1b088.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5525ed7b916441298663e2afd7080dd.pdf
    • https://static.usrfiles.com/ugd/b8c837_7f8ddeb52c60424d8904ebf6f34246fe.pdf
    • https://static.usrfiles.com/ugd/b8c837_5d1585b03d2447ef80abc8ce87e08c31.pdf
    • https://cdn.shopify.com/s/files/1/0432/6539/2804/files/92160789630.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99231100330.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/pubizuxurugemosit.pdf
    • https://cdn.shopify.com/s/files/1/0432/5864/2595/files/60219545212.pdf
    • https://cdn.shopify.com/s/files/1/0440/4543/5030/files/import_csv_into_mysql.pdf
    • https://cdn.shopify.com/s/files/1/0431/9176/3105/files/adobe_reader_xi_11._0_09_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/7090/5756/files/eve_online_careers.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_off00006be6.bin
91d493b46f2b8815807d78693baafec759c3c0fffb86b6317648113137840151		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE6 5344 bytes
font_01_sfnt_off00007dea.bin
1f968979c6c01dbc9366a5deb0a78c554caa81653d1893ca7436c638e4d4e7da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 10744 bytes

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