Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce35f352c68c1d7f…

MALICIOUS

PDF

43.1 KB Created: 2020-09-01 01:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b32e8165a7fe48332112929efd61959c SHA-1: 0e35755c1c1580ca4e696847a96675bde36a78df SHA-256: ce35f352c68c1d7fb9c427767b3c2873d1effb9f5d0d60bb43144fc655016664
150 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body text, though heavily obfuscated, contains the phrase 'Census application form 2019 zambia' and the malicious URL, suggesting a lure. The PDF also contains a large number of external links, many pointing to static.usrfiles.com, which is flagged as a link farm.

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.cc/wix?keyword=census+application+form+2019+zambia
    • https://static.usrfiles.com/ugd/3e5d97_2f529506ae914100b1ccce31c07a4a19.pdf
    • https://static.usrfiles.com/ugd/b8c837_012eaa64d26d44bcacde788e94d234b1.pdf
    • https://static.usrfiles.com/ugd/0d002d_805deebb93cf44c085b9c6e5e9b9ba34.pdf
    • https://static.usrfiles.com/ugd/cc089a_1bc3167f60524a058e715c0e6b13329d.pdf
    • https://static.usrfiles.com/ugd/cc03df_864297274dcf48b5b4dd745a7d09df30.pdf
    • https://static.usrfiles.com/ugd/a18aa6_3d8bea7dc7e74a9f88538b8000175585.pdf
    • https://static.usrfiles.com/ugd/b8c837_cb47b5f1d4014dbdb96ac6e2fda0fb45.pdf
    • https://static.usrfiles.com/ugd/d01287_081628d88edc48b4ac8714e1fac3947f.pdf
    • https://static.usrfiles.com/ugd/b8c837_1bb02df74e0c4388b2052b7cbe492e65.pdf
    • https://cdn.shopify.com/s/files/1/0430/3680/3233/files/jirokimofosuwotefep.pdf
    • https://cdn.shopify.com/s/files/1/0438/1717/3149/files/pillars_of_eternity_2_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0440/2357/8789/files/black_and_white_emojis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5048/3368/files/bemejolugideto.pdf
    • https://cdn.shopify.com/s/files/1/0437/1621/4936/files/anaerobic_digestion_process_steps.pdf
    • https://cdn.shopify.com/s/files/1/0462/7736/1813/files/fluoride_varnish_information_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_off00006810.bin
3be202c7a9ad3613198728e376bed928393824f48679b7f4429a28b3ac40267c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6810 5736 bytes
font_01_sfnt_off00007b82.bin
67606cc92d40c084c656882f31532e3b9da1c8a37a54e56519ee97055a409f3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B82 10452 bytes

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