Malicious PDF — malware analysis report

Static analysis result for SHA-256 570c91d84cae8197…

MALICIOUS

PDF

34.6 KB Created: 2020-08-22 19:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5477f383ee44a707a1315fde9f2a3e4 SHA-1: 1369b18c49a1f22ef1edf3f9f8a28d97b91fe63f SHA-256: 570c91d84cae8197998907be22bdcdae7d777f4566ca2310ab4ee4ae079601cc
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, many pointing to Shopify domains, but one critical link redirects to a known malicious domain (ttraff.cc). This suggests a link farm or SEO poisoning technique used to lure victims. The document body, though heavily obfuscated, contains text related to 'Archicad 15 tutorial pdf free' and the malicious redirector URL, reinforcing the lure. 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.cc/pify?keyword=archicad+15+tutorial+pdf+free
    • http://roser.insightcounsellingtoronto.com/uploads/1/3/1/4/131414661/boregetunajilulod.pdf
    • http://files.oatvalleybaptist.com/uploads/1/3/2/6/132695339/7605778.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4114/files/asian_history_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/xakumimujapiwezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9753/9231/files/fundamentals_of_applied_dynamics_williams.pdf
    • https://cdn.shopify.com/s/files/1/0435/7767/1843/files/34901648656.pdf
    • https://cdn.shopify.com/s/files/1/0431/3009/3728/files/9073317493.pdf
    • https://cdn.shopify.com/s/files/1/0440/7027/3174/files/17564728456.pdf
    • https://cdn.shopify.com/s/files/1/0432/7440/3996/files/vibemizaluke.pdf
    • https://cdn.shopify.com/s/files/1/0440/8901/6472/files/dofapurodufub.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_off000048e2.bin
87eb193a4b2db2b7dc5598d79aa5bbd44f4da8bda895459ebd2273bef1cd07a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x48E2 5232 bytes
font_01_sfnt_off00005aa9.bin
295ac34fb75488cf795fcf099bcacffaaeb1784c8b2fb5af86b0d54ed8e0d498		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA9 10320 bytes

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