Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f4c5270720ffc4…

MALICIOUS

PDF

40.1 KB Created: 2020-08-19 10:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9713c0a8742f16f14f96e1f07527fb98 SHA-1: b880ad49c5a9ec4bb979457ea66afbe858bdfc45 SHA-256: 52f4c5270720ffc4fd33c0074d40fae86eb24de526079b8a7e606bab8da5c955
150 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, pointing to ttraff.ru. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same redirector URL and several other embedded URLs that are likely part of the same infrastructure. The primary intent appears to be redirecting users to malicious content.

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=4+bedroom+apartment+floor+plans+pdf
    • http://files.pitbulls4people.org/uploads/1/3/1/4/131453323/zeladev-wukokijarivipo-polelegorakubo-pujobedufa.pdf
    • http://nisej.msgipesays.com/uploads/1/3/2/3/132303382/bozanabir.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/sowugimixadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/39108388219.pdf
    • https://cdn.shopify.com/s/files/1/0432/5723/3576/files/70876908218.pdf
    • https://cdn.shopify.com/s/files/1/0431/9802/1793/files/la_vida_a_travs_del_espejo.pdf
    • https://cdn.shopify.com/s/files/1/0449/5409/1675/files/reset_mysql_root_password.pdf
    • https://cdn.shopify.com/s/files/1/0433/7814/7491/files/54405173111.pdf
    • https://cdn.shopify.com/s/files/1/0432/2266/3325/files/10142283096.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/62318176878.pdf
    • https://cdn.shopify.com/s/files/1/0437/6746/4093/files/2017_audi_q5_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/7028/2142/files/40988349716.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_off00005fba.bin
8e8c485c608035ea7291e29ec26b09eeb83754d4f315f9b6c6aea6f964b82138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FBA 5320 bytes
font_01_sfnt_off000071b1.bin
e92ce0b002ac3444f97240e32593ff7a9f13238d7aba98786eb989de3a8677ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 10160 bytes

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