Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cbd2853ceeffc0…

MALICIOUS

PDF

35.7 KB Created: 2020-08-31 17:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c366c011a1d84a841c62e72fff033d6a SHA-1: f242f9897a8168f36e9382547d86a37a240b66ad SHA-256: 26cbd2853ceeffc064569abb09d9848d71e0cec6c9325739b9f39d2e01779938
150 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a high density of embedded links. One of these links, https://ttraff.com/wix?keyword=cb+background+hd++apk, points to a known malicious redirector. The document body contains garbled text but also includes the same malicious URL and several other URLs hosted on Shopify, suggesting a link farm or redirection strategy. The primary attack pattern involves luring the user to a malicious site via these links.

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.com/wix?keyword=cb+background+hd++apk
    • https://cdn.shopify.com/s/files/1/0436/8901/7497/files/amadeus_all_commands.pdf
    • https://cdn.shopify.com/s/files/1/0438/0105/1293/files/tafopurigewoku.pdf
    • https://cdn.shopify.com/s/files/1/0433/6694/0828/files/php_rekey_array.pdf
    • https://cdn.shopify.com/s/files/1/0431/7629/6605/files/redajinujojenujijojasekog.pdf
    • https://cdn.shopify.com/s/files/1/0434/5325/1751/files/66897142626.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/35481506884.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/46229808658.pdf
    • https://cdn.shopify.com/s/files/1/0436/1001/3853/files/bleeping_computer_jrt.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/92303811222.pdf
    • https://cdn.shopify.com/s/files/1/0433/6674/4216/files/adobe_flash_player_for_iphone_8.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6231/files/facebook_timeline_template_psd_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/3541/0077/files/79688381095.pdf
    • https://cdn.shopify.com/s/files/1/0437/4226/5498/files/29109580225.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_off00004d8e.bin
077575310fbd3ba6a25b1051106570bdbc688abc8c3ac649c1f399d0ab2a2f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D8E 5236 bytes
font_01_sfnt_off00005f4b.bin
9d338000c1e16606b294c4b517c2992c344d60d54e7f7b987d6f5aad60dabc05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4B 10236 bytes

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