Malicious PDF — malware analysis report

Static analysis result for SHA-256 525a0667fbbd9d52…

MALICIOUS

PDF

45.3 KB Created: 2020-07-31 10:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fb5199c1a9ffbfb3f74f92bf46f7da9 SHA-1: 4194dd0c1ad5e54e4862b5e67a30ddb1b3925761 SHA-256: 525a0667fbbd9d521dc76f29602a7ffcd6e4c4ac03cf6afb87dbba6956ed69dd
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for PDF_SEO_LINK_FARM indicating a link farm. One of these links, 'https://ttraff.ru/pify?keyword=calendario+escolar+2020+pdf+nicaragua', is flagged as a malicious redirector. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, reinforcing the idea that the primary function is link distribution.

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.ru/pify?keyword=calendario+escolar+2020+pdf+nicaragua
    • http://files.neilbuanarchitects.com/uploads/1/3/2/8/132815343/wasim.pdf
    • http://files.massagebyfemale.com/uploads/1/3/1/3/131380870/zemowonelisapuluxux.pdf
    • http://files.falconlegalconsulting.com/uploads/1/3/2/6/132683357/9d54b898869.pdf
    • http://files.sensibleshock.com/uploads/1/3/2/7/132740479/vasesejakukek_faxej_lelikam.pdf
    • http://files.sensibleshock.com
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/zuvinovekimupirubizuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lipowu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4987/6630/files/6874167487.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2103/files/modozan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/dakuvujojatedurowe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/73929646005.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/31730015490.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/25222706469.pdf
    • https://cdn.shopify.com/s/files/1/0431/8268/6367/files/84886450039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/73798982105.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/6408457534.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_off0000711e.bin
557631a171bf1f83d96c1bfe95a23e076d10c53f7a5dbe31e0bbb67f04879b7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711E 5420 bytes
font_01_sfnt_off00008397.bin
c6551f52c2e13dab1efd1b30472fef50cd192dc23266afcae95a560af5798d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8397 10704 bytes

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