Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2cea41baf7e171a…

MALICIOUS

PDF

54.5 KB Created: 2020-08-30 01:22:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4966a43c85a923c23539d8d57b512f7a SHA-1: b48adfcf5d46e61fd067e09a19e4c18e96d143ce SHA-256: d2cea41baf7e171acfb5a2b83bb0b4f5b53abea8fac097171110d8bb34533e38
120 Risk Score

Malware Insights

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

The PDF file was flagged for containing a malicious redirector link and a large number of embedded links, indicating a link farm. The primary malicious URL identified is https://ttraff.com/wix?keyword=mrua+caida+libre+ejercicios+resueltos. The document body contains garbled text but also includes the same malicious URL and several benign-looking PDF links, suggesting an attempt to disguise malicious activity within a large number of links.

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=mrua+caida+libre+ejercicios+resueltos
    • https://static.usrfiles.com/ugd/b8c837_90377477b0904e5ababda945b3dd6dce.pdf
    • https://static.usrfiles.com/ugd/136d07_80802f65c4974dc58953cc1c29e571e2.pdf
    • https://static.usrfiles.com/ugd/b8c837_c5457d31b2ec4059a31b98aa8781f0d3.pdf
    • https://static.usrfiles.com/ugd/48d9a1_d85213e8cea04b6da0a3fce61c44d810.pdf
    • https://static.usrfiles.com/ugd/b8c837_4e2aacc39c9b4d2cb4a4ad025b9efbc1.pdf
    • https://cdn.shopify.com/s/files/1/0439/2576/6312/files/4728770817.pdf
    • https://cdn.shopify.com/s/files/1/0449/3757/6603/files/welbilt_bread_machine_manual.pdf
    • https://cdn.shopify.com/s/files/1/0450/4341/7246/files/atul_maheshwari_chatravriti_yojna_2020.pdf
    • https://cdn.shopify.com/s/files/1/0440/9357/1224/files/formica_countertop_replacement_cost.pdf
    • https://static.usrfiles.com/ugd/0049ca_cda32a900b514c5ead5f303cda1e43df.pdf
    • https://static.usrfiles.com/ugd/7f46b5_0095a46e647b4c089258f647233338d9.pdf
    • https://static.usrfiles.com/ugd/b8c837_33e1cc63d4504eafa87113d5abcd29bb.pdf
    • https://static.usrfiles.com/ugd/a771bd_100861abd2834bb78e4139b74096d880.pdf
    • https://static.usrfiles.com/ugd/9757e7_7181d769eb56470d8f62c90d89118270.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_2634caa29317432da463432dc10e6c9a.pdf
    • https://static.usrfiles.com/ugd/8cbfce_a66f63e84dd7469ea9468dd5886ca48a.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061cc.bin
3d4760ca295192c89086870ebbac49c5a5945404ea6ab57fca452cf2db5f569a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 6440 bytes
font_01_sfnt_off000071c0.bin
71ebcb50ff0869271de5685cb2d58c32f0d16e300f9c2b9565a5388728524b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C0 5156 bytes
font_02_sfnt_off0000834d.bin
8557e22890982bcf48a5349cdaae36a85fbaafab5416c10e97c1e14c074d71ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x834D 3676 bytes
font_03_sfnt_off00009147.bin
535e8bda0f4b616783cb9a5092453b9db5a200801d50a80c62c3ec4be07c6a40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9147 10736 bytes
font_04_sfnt_off0000b46c.bin
9c47a8ecf7103172530608de19fa11afb8a035ab51042e9cb8c6809f09ebb189		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46C 16344 bytes

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