Malicious PDF — malware analysis report

Static analysis result for SHA-256 9840219fdb338f46…

MALICIOUS

PDF

34.6 KB Created: 2020-09-01 00:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ffdfb0a793c42d89ea7b3db1eb7f7f57 SHA-1: 5e601f659f107b9b687a62251a11c4fe131cf597 SHA-256: 9840219fdb338f46694a04a51ddc2c3f22ce128edb2929818c804d874831e16d
120 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, which points to 'https://ttraff.me/wix?keyword=comparative+and+superlatives+worksheet+pdf'. The document body, though heavily obfuscated, contains text related to 'comparative and superlatives worksheet pdf', suggesting a lure to disguise the malicious intent. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to 'static.usrfiles.com'.

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.me/wix?keyword=comparative+and+superlatives+worksheet+pdf
    • https://static.usrfiles.com/ugd/6924eb_f3d43c378a814add80e3019e4f63629b.pdf
    • https://static.usrfiles.com/ugd/dfb5f8_3c4dd161e539448b804a124af493ce78.pdf
    • https://static.usrfiles.com/ugd/c3f88d_f7c5e24d1bdc40fc89b7f59dae26864d.pdf
    • https://static.usrfiles.com/ugd/b8c837_ddbbd5f0e68a4e4d8a973a8d228d58dd.pdf
    • https://static.usrfiles.com/ugd/7f46b5_0ff7785bf8e64b949968ced6cc657c17.pdf
    • https://static.usrfiles.com/ugd/9b7d8a_050fbd722e524d7d89725239b22fdf96.pdf
    • https://static.usrfiles.com/ugd/b8c837_790f5b5790084de09fb769b98c727ceb.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/rividu.pdf
    • https://cdn.shopify.com/s/files/1/0437/2535/7206/files/ampere_s_circuital_law_proof.pdf
    • https://cdn.shopify.com/s/files/1/0431/9503/9905/files/resupikatezuvugoxijapuge.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/all_pashto_audio_songs_free.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_off0000474a.bin
61b49a9b06349abc306c92aeedd595a53294c9e1b757b0ed5481f8c9a9a53dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x474A 5400 bytes
font_01_sfnt_off0000598c.bin
11d30b8e93f82346937f4565aba135da33942d18b21aa22e3263a4e22592aac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598C 11224 bytes

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