Malicious PDF — malware analysis report

Static analysis result for SHA-256 5790cd3dddb0bc6f…

MALICIOUS

PDF

46.0 KB Created: 2020-08-29 20:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae6d19318765252b02d4398e2ec9014 SHA-1: e9f4a2c16fd985828a530ae12523a15a6e32b72e SHA-256: 5790cd3dddb0bc6f425685298547e30c2727755379f64a59813c8a5757eaa82f
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous other links, likely part of a broader campaign to distribute malicious content. The ML_NYX_PDF_MALICIOUS classifier also strongly supports the malicious nature of this file.

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.club/wix?keyword=tnpsc+assistant+system+engineer+syllabus
    • https://static.usrfiles.com/ugd/2c8d66_909bba51eece41a8a9c0cd9e6c1cd24a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9dcbb7440464f94805d8184ef6f772f.pdf
    • https://static.usrfiles.com/ugd/6a7407_4f98ff1572d7461e991cb562cf97cffa.pdf
    • https://static.usrfiles.com/ugd/b8c837_66acace23f7948cab8c857045f26fa7b.pdf
    • https://static.usrfiles.com/ugd/8127dd_79cc354952304475a9041b53821a2376.pdf
    • https://static.usrfiles.com/ugd/b8c837_0ea82feab48846e2affe08e1fd49485a.pdf
    • https://static.usrfiles.com/ugd/b8c837_d677b29a6416467589e064af1dc510c2.pdf
    • https://static.usrfiles.com/ugd/2f3ac6_ada0539f3af946a8949de02e4053f3fa.pdf
    • https://cdn.shopify.com/s/files/1/0435/7806/5059/files/10389408735.pdf
    • https://cdn.shopify.com/s/files/1/0433/7221/6483/files/what_is_1._3_as_a_fraction.pdf
    • https://cdn.shopify.com/s/files/1/0440/7663/0181/files/xunivatiwonif.pdf
    • https://static.usrfiles.com/ugd/b8c837_a230fa2142044e48af3935b18ed18634.pdf
    • https://static.usrfiles.com/ugd/e2c250_40b511b666c54b1e8f1a4ed6abb74db7.pdf
    • https://static.usrfiles.com/ugd/9219f8_905d48146cec4b158a770f322227ffe1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000630c.bin
76d4b2e170483dec5dedbdd88762b59265a9f0151573508040bf827e9d31e59e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x630C 5444 bytes
font_01_sfnt_off00007571.bin
bc241f7580c137ebb54cd4f3dfa605c6ab21584ff90223315001cf86c90c4c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7571 6024 bytes
font_02_sfnt_off000088e2.bin
590e6ac5535dfbc55b0418f910153f7252cc3290ffba4933775353ab6697d57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88E2 9964 bytes

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