Malicious PDF — malware analysis report

Static analysis result for SHA-256 203cc76bfb65a8e8…

MALICIOUS

PDF

47.1 KB Created: 2020-08-11 03:54:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ab949ffffda15ca01e94eb5044f7308 SHA-1: 0dd550d625f9c807d1e2d6fcaaa8f9c8ae497c23 SHA-256: 203cc76bfb65a8e81b9de2ac7da100cf58146f5cf267c5169cc526098207b306
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used in conjunction with a keyword related to Excel formulas to lure victims. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=food+cost+percentage+formula+excel+pdf
    • http://files.fcaedu.org/uploads/1/3/0/7/130738892/ketajogopamo.pdf
    • http://files.friendsofthemadriver.org/uploads/1/3/1/4/131482853/gaketaxilad-lakuvatigosadom.pdf
    • http://files.spectrumdyslexiavision.co.uk/uploads/1/3/2/3/132303270/7599455.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/lebawiwasagenox.pdf
    • https://cdn.shopify.com/s/files/1/0439/0384/4520/files/kadidaxugegu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7141/files/road_trippin_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/ripinanimevudusad.pdf
    • https://cdn.shopify.com/s/files/1/0431/1459/4466/files/gebazakukesokiburaruseza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/catalogo_andrea_escolar_2020.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/62566718187.pdf
    • https://cdn.shopify.com/s/files/1/0431/1135/0439/files/wordly_wise_book_5_lesson_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/ss13_radio_frequencies.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/14158949671.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/pepawaniru.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6237/files/86287055922.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_off00007839.bin
dbbbd9a7134a6a5dc97c725254e74b62eeb5e5892192b6024a56b2deb809c455		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7839 5496 bytes
font_01_sfnt_off00008adb.bin
287cd7c0229b050eb307692bea3aeefb5abb3020fcb92a9929f3433d9f051171		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8ADB 10580 bytes

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