Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c310545d423afe…

MALICIOUS

PDF

40.5 KB Created: 2020-08-30 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b1d7894f338cce8975fa558480274a SHA-1: cd085b863c34646e48949651239fe30c0845d9eb SHA-256: d4c310545d423afe5750f7da1e35e16c34d45b90395635493260cf6d1a6b0958
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a PDF link farm, with one link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'New York subway map' and the authoring application, suggesting a lure to disguise the malicious intent. 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.com/wix?keyword=new+york+subway+map
    • https://cdn.shopify.com/s/files/1/0434/9093/4949/files/atari_2600_adventure_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/3335/3627/files/99761530320.pdf
    • https://cdn.shopify.com/s/files/1/0431/4028/4583/files/careplus_authorization_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/3989/1357/files/liridasopugisewepofonoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/3358/4028/files/motor_service_factor.pdf
    • https://cdn.shopify.com/s/files/1/0439/0879/2475/files/fovevozusixajozugojixav.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_033164b99c7b4aacb5ec1b167aa572bf.pdf
    • https://static.usrfiles.com/ugd/37321e_3d2b2812d31645638a92f26b7bd0371c.pdf
    • https://cdn.shopify.com/s/files/1/0447/1701/5194/files/antenna_theory_and_design_third_edition_so.pdf
    • https://cdn.shopify.com/s/files/1/0431/6368/0929/files/43809170758.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_off0000611b.bin
34a3391e22ea1ac694307e8fd9ea0734149674d5b7c70406d4d40409353e805f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611B 5300 bytes
font_01_sfnt_off00007326.bin
8f265373965a9ed83ebd139f5fbf5d3b877475913a24fa474a931de9b8435c02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7326 10232 bytes

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