Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3b3d227df3cd13…

MALICIOUS

PDF

33.5 KB Created: 2020-08-30 17:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab0f12b2e6e2914c00713f477b3b7d59 SHA-1: 697003e59cf4a9c620684f2d3e7e9784d318d333 SHA-256: 1c3b3d227df3cd13e5131b0b672a92219d035b0e2d0d957be9991abe98736a96
150 Risk Score

Malware Insights

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

The PDF file contains a malicious redirector link disguised as a download for an 'Xbla unlocker'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link points to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, suggesting a link farm designed to attract traffic. The ML_NYX_PDF_MALICIOUS classifier also strongly flagged this file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=xbla+unlocker+descargar
    • https://static.usrfiles.com/ugd/f459ea_ea2b22a27eaf42b4922354e098b45fa6.pdf
    • https://static.usrfiles.com/ugd/d7ba0f_c51fe2ec760f4cc19abb606da02ed47d.pdf
    • https://static.usrfiles.com/ugd/b8c837_9de4dfa3c6964f938a672be2f94dec18.pdf
    • https://static.usrfiles.com/ugd/c63dba_373b289269a34623ba4016b3257c0d28.pdf
    • https://static.usrfiles.com/ugd/f96b02_d40d5051eec748f2a03153d984c5c9eb.pdf
    • https://static.usrfiles.com/ugd/fbccce_3117219ad6d44c86af9e05f065a7b877.pdf
    • https://static.usrfiles.com/ugd/7f16bd_339c1b8c492242878c0236dee02c9266.pdf
    • https://static.usrfiles.com/ugd/b8c837_81d617f85a66486da067242511db2bf0.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_eda757080dbf413583880e8f11ae0c99.pdf
    • https://cdn.shopify.com/s/files/1/0429/8765/1235/files/ap_calculus_textbook_larson.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/lepevolakotimufefafuxale.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/types_of_waste_to_energy_technologies.pdf
    • https://cdn.shopify.com/s/files/1/0431/8792/9245/files/haynes_vs_chilton.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/92831620644.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/consolidated_audit_report_format_2019_unlisted.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_off00004563.bin
e98beaafc2f1bb299a50c577b5285f4cbce672799de974df1913ccc50b7d47df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4563 5288 bytes
font_01_sfnt_off00005760.bin
e909fd2d7395395152ca398cc9623314dc0fbb2906723d95ac3c0c9b6b9aa374		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5760 9968 bytes

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