Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad366668f6c2e11…

MALICIOUS

PDF

35.1 KB Created: 2020-08-18 19:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af47decdd199de031f199022df556fd4 SHA-1: 7f470d50ec9a4cc3ae233feaf6e5428eb31c6897 SHA-256: 1ad366668f6c2e11c01f2855a755a9b4be6bbcd25c3422564de397ff24b49606
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.cc/pify?keyword=writing+iambic+pentameter+worksheet'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily corrupted, contains the same malicious URL and benign-looking worksheet title, suggesting a lure to trick users into clicking the malicious link.

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.cc/pify?keyword=writing+iambic+pentameter+worksheet
    • http://files.tubesutas.com/uploads/1/3/1/6/131607712/kofav.pdf
    • https://cdn.shopify.com/s/files/1/0437/4256/0405/files/zesimeremukas.pdf
    • https://cdn.shopify.com/s/files/1/0430/7743/5556/files/54646823401.pdf
    • https://cdn.shopify.com/s/files/1/0439/0620/3803/files/ccie_wireless_v3_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/65294746239.pdf
    • https://cdn.shopify.com/s/files/1/0430/7927/0549/files/47226288348.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/ximofaveki.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/77146313655.pdf
    • https://cdn.shopify.com/s/files/1/0432/6657/2441/files/soruwugabawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/clicker_heroes_save_editor.pdf
    • https://cdn.shopify.com/s/files/1/0436/3033/0016/files/66268455920.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/neneruguleribelop.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/10809735118.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_off00004ba7.bin
1bf4e9cdd971233977ecb299f650a15d33631a7198123842dfb7ee64ba7eae95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA7 5624 bytes
font_01_sfnt_off00005eac.bin
90e3dd12e0b1b14a7645184b3b458f5ae850d8c03f9734b4c5a5ffb4202c546e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAC 9716 bytes

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