Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ce82deab6781c0d…

MALICIOUS

PDF

44.8 KB Created: 2020-09-03 03:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac54450a2df729aec60d8bd817a824c3 SHA-1: 2b799099fb0ff485e96ab6dccd7da9801786b365 SHA-256: 2ce82deab6781c0d386be9ac7e2be8d5cde8cd4203f197575146c65ac1296db3
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.me'. This link is presented within the document body, disguised as a 'Cabot exterior wood stain color guide'. The presence of numerous other links to PDF files hosted on various domains, including a significant number on 'static.usrfiles.com', suggests a link farm or SEO poisoning tactic to obscure the malicious redirect. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=cabot+exterior+wood+stain+color+guide
    • https://cdn.shopify.com/s/files/1/0431/6240/2965/files/dumamugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7935/files/60975225573.pdf
    • https://cdn.shopify.com/s/files/1/0454/2480/3998/files/envision_math_2._0_volume_1_grade_5_answer_key.pdf
    • https://static.usrfiles.com/ugd/0bcf16_c394d2e0af07451fbd641fe9300a60d2.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8031d42ae524fa693961c2293c7a5be.pdf
    • https://static.usrfiles.com/ugd/5befcb_acf81071e2c74283b48035e82e969731.pdf
    • https://static.usrfiles.com/ugd/49be48_ad87d78af35c44a4a32b5e99a4520070.pdf
    • https://static.usrfiles.com/ugd/2b25b5_80c5c6535d7d466383db760b50ae2243.pdf
    • https://static.usrfiles.com/ugd/9a242c_3a74ef26d3ca40a48e5ebb953db100ad.pdf
    • https://static.usrfiles.com/ugd/a51aec_0188e91896ac49f2b5a6ff9234665766.pdf
    • https://static.usrfiles.com/ugd/1b7c00_5ac8573d7a284b3c88ffeeecf699f5d8.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/k_series_engine_swap_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8583/1070/files/banting_diet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8211/1381/files/lapamunalus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4856/6938/files/abronia_care_sheet.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_off00006f5e.bin
a8770e355604705a4a7419f7ce8ff993ffecdf916053d7cbafad4e348ab2b50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F5E 5312 bytes
font_01_sfnt_off0000818b.bin
d20f37187c88fcc03929844abfcedbf7f120667160f53e308390111977807d63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x818B 10672 bytes

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