Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e6e144b87502d4…

MALICIOUS

PDF

35.4 KB Created: 2020-08-15 07:44:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98c2f4ae5090199d871cb94f100eaebc SHA-1: ee8898f7a016dbb112269cf19d22187d00440b5b SHA-256: b0e6e144b87502d4e5a76be6b677268dda47ac395228c32ecd80d7d60c4c82e5
150 Risk Score

Malware Insights

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

The PDF file was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm designed to distribute malicious content. The primary malicious URL identified is ttraff.ru, which is used as a redirector. The document body contains garbled text and metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

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/pify?keyword=alter+ego+a1+manuel+pdf
    • http://files.qhcc.org/uploads/1/3/2/7/132740285/tavufazixo-nezunape-memev.pdf
    • http://files.northerntaxidermyart.com/uploads/1/3/0/7/130739069/c893c23aac7a02.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/93986137891.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0202/files/download_phn_mm_ct_file_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/niwadajupepipopewikaxu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/sufijavutevesunade.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2450/files/the_elliptic_curve_digital_signature_algorithm_ecdsa.pdf
    • https://cdn.shopify.com/s/files/1/0435/2425/9992/files/39187775985.pdf
    • https://cdn.shopify.com/s/files/1/0454/3774/7358/files/jateludimefame.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/98406968885.pdf
    • https://cdn.shopify.com/s/files/1/0431/5086/8646/files/wuwonakug.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6909/files/discord_invisible_text.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004135.bin
a38eed212d5dfab224a64873fa0d0d2fefa2e975ea10d2f7bb931818bfd60114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4135 5056 bytes
font_01_sfnt_off0000524a.bin
b13d12d524de6113a86ff128c4bc62139e65bd38afb0d528c6223d16f776e9ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x524A 9824 bytes
font_02_sfnt_off0000732b.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x732B 4324 bytes

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