Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37c1875a53aecc8…

MALICIOUS

PDF

41.2 KB Created: 2020-08-04 11:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9760386ec8cb03be1ba313874df2bf14 SHA-1: 0889349742bb298caf3d205a327c54f0f8edd467 SHA-256: d37c1875a53aecc8425219c802fd5a47333a137e3c3a0f9669ad79142e532e78
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO link farming to improve search engine rankings for malicious content. One of the primary links directs to a known malicious redirector, ttraff.cc, which is disguised as a PDF about algorithms and flowcharts. This suggests the document is a lure to redirect users to malicious infrastructure.

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=questions+on+algorithms+and+flowcharts+pdf
    • http://files.signatureshape.ca/uploads/1/3/1/8/131856158/87548cd45aaf601.pdf
    • http://files.suemediaproductions.com/uploads/1/3/0/8/130813366/cac1193.pdf
    • http://files.whateverandthensome.com/uploads/1/3/1/4/131453610/3d574f7fc437.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lalosukiwafigoledexefes.pdf
    • https://cdn.shopify.com/s/files/1/0433/4357/7256/files/39804790975.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3031/files/11382476097.pdf
    • https://cdn.shopify.com/s/files/1/0430/3188/8035/files/91472480811.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/drow_subrace_5e.pdf
    • https://cdn.shopify.com/s/files/1/0434/0717/9941/files/lafuguparulatavumojog.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/31525727498.pdf
    • https://cdn.shopify.com/s/files/1/0438/5705/1808/files/hurst_review_files.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/98317746876.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/takazuxakotadadaraz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97897646990.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/tadewi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9575/2864/files/9294904854.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_off00006151.bin
d905fcb1c7e20b9f334a6988a229338aa7a419431d54e607196901d6bad40d8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6151 5724 bytes
font_01_sfnt_off000074b8.bin
19ca5b2455f2b7571e0bb4d04f4a92f905aba649dda1582f0b310f7cd448fdd1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74B8 10388 bytes

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