Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b7ba13ae0b859f7…

MALICIOUS

PDF

37.5 KB Created: 2020-08-30 08:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c169cd224d5448556b290b11610304b2 SHA-1: 7968a3460a861cd8b9624ebe5284d66efa1d1337 SHA-256: 8b7ba13ae0b859f780cdcbf827fa9487dae3e9eac211579cbf8bf6ffb46097c8
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The embedded URL 'https://ttraff.ru/wix?keyword=theme+maker+chrome' is identified as a malicious redirector. The presence of numerous links, including 'https://cdn.shopify.com/s/files/1/0439/1138/1147/files/tinkers_construct_shocking.pdf', suggests an attempt to lure users to external, potentially harmful, sites. The ML classifier also strongly indicated maliciousness.

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=theme+maker+chrome
    • https://cdn.shopify.com/s/files/1/0439/1138/1147/files/tinkers_construct_shocking.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/49346090395.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/crafting_and_building_guide.pdf
    • https://static.usrfiles.com/ugd/ab0441_15811e89ff374b4391b3b3bd27f3252c.pdf
    • https://static.usrfiles.com/ugd/93971e_bd255161516e4923acc181104a4aaed2.pdf
    • https://cdn.shopify.com/s/files/1/0435/8724/0093/files/28719395043.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/operational_amplifier_nptel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6050/files/31688912763.pdf
    • https://cdn.shopify.com/s/files/1/0428/9213/2508/files/70876747872.pdf
    • https://cdn.shopify.com/s/files/1/0432/9606/3652/files/94425119612.pdf
    • https://static.usrfiles.com/ugd/dc98cc_ac67b3af6dfc4a56a0b8f3b5c6b8df5e.pdf
    • https://static.usrfiles.com/ugd/9219f8_e2b96af3569a4e619c86c8c8aacac638.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_off00005860.bin
9c103753b24957a9bd80f92325ab83eb53b960b363bf54b1fa278dc581bc0b6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5860 4844 bytes
font_01_sfnt_off000068ad.bin
782ede86ca9ee5fcb7cbbfc4df60c4dbbffb49316fbac7f4fe4f915c6b927ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68AD 9740 bytes

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