Malicious PDF — malware analysis report

Static analysis result for SHA-256 3073083ffe25a74a…

MALICIOUS

PDF

40.9 KB Created: 2020-08-29 21:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e3ed97aee9c74581d3d0eec6f14dd0b SHA-1: cb5ab58495a4375afe52fed23009301d7ec0eb46 SHA-256: 3073083ffe25a74af4aa81339e67e85c5fd24acc8f5519a4f39697d085e1e1e7
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text related to 'Cornell notes template blank' and the malicious URL, suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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/wix?keyword=cornell+notes+template+blank
    • https://cdn.shopify.com/s/files/1/0427/8062/3015/files/dcfs_report_form_california.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6293/files/warogiba.pdf
    • https://cdn.shopify.com/s/files/1/0439/0020/7272/files/xitupowavidemem.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7312/files/advantages_of_logical_framework.pdf
    • https://cdn.shopify.com/s/files/1/0431/5689/7947/files/vetegavekol.pdf
    • https://cdn.shopify.com/s/files/1/0430/0229/8521/files/27296238127.pdf
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/fazatimukewum.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/arqueologia_del_saber_michel_foucault_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/80331974251.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cd78ef61c8b4b4a890cdbd5784aca72.pdf
    • https://static.usrfiles.com/ugd/b8c837_bb4d0b3c08ad49eab3d4c4a0914c1d7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_87f33e0bafed4d5fab536b8245b00c96.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/pikukowupesujaxeket.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/bafikafejuboze.pdf
    • https://cdn.shopify.com/s/files/1/0447/9772/2785/files/aadhaar_card_correction_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/80331955862.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_off000064a4.bin
2cefb287b9b9a88ff831a92b3b342ee42f7e7b07d5d38bc8c0bd06bfeb944341
pdf-font-stream PDF embedded font (sfnt) at offset 0x64A4 5072 bytes
font_01_sfnt_off000075c0.bin
662a895e69161791afabde8318abd74d04ca7466a7e3bf4416f9bcd768d8f877
pdf-font-stream PDF embedded font (sfnt) at offset 0x75C0 9632 bytes