Malicious PDF — malware analysis report

Static analysis result for SHA-256 8834e5daf7d7dee8…

MALICIOUS

PDF

46.1 KB Created: 2020-08-29 21:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc766810d9e313f0bd25744381a3a05f SHA-1: b4fd63197e4b1dc5c1baa33d58ea459270b47e52 SHA-256: 8834e5daf7d7dee8fc92cac302315fa36127c04baecfd224b4b20855ed9ff458
150 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/wix?keyword=btwin+rockrider+560+review', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to external 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/wix?keyword=btwin+rockrider+560+review
    • https://cdn.shopify.com/s/files/1/0429/4118/6215/files/bogie_train.pdf
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/nukigo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/factorio_balancer_blueprints.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1336/files/dakavujolabeni.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/free_online_software_to_edit_documents.pdf
    • https://cdn.shopify.com/s/files/1/0431/2177/0656/files/fotimited.pdf
    • https://cdn.shopify.com/s/files/1/0437/6988/8917/files/75801485354.pdf
    • https://cdn.shopify.com/s/files/1/0433/6759/6184/files/sports_vocabulary_games.pdf
    • https://cdn.shopify.com/s/files/1/0429/5681/6540/files/wutudubinisin.pdf
    • https://cdn.shopify.com/s/files/1/0433/8653/6092/files/nulaxaponaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/32940781822.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_off000075f4.bin
e0438be3578e549f3a15a9ec256cfa825fbb156742482311aa4ac2117d744419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F4 5196 bytes
font_01_sfnt_off000087cf.bin
ca58dffc4d8b6895fa7b69e110f7419c79d18cdaf1e68d56bdb4c2d9a16bc687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87CF 10516 bytes

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