Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ed46b17fb9b26a…

MALICIOUS

PDF

41.4 KB Created: 2020-08-01 08:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96fa470b14a33868f0457d668300265c SHA-1: 448a81b9bdd311365b5996f1af17a21aeb05a70a SHA-256: a0ed46b17fb9b26a412e4b57f506b5b4d207f50ec98e9741359838b302f72fff
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=actex+exam+p+study+manual+pdf'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a link farm or redirection strategy. 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=actex+exam+p+study+manual+pdf
    • http://files.carsontidwell.com/uploads/1/3/1/4/131438249/mumiv.pdf
    • http://files.criticalmassdancecompany.org/uploads/1/3/1/0/131071256/4655861.pdf
    • http://files.mycanyonheights.com/uploads/1/3/1/4/131406947/e90294e.pdf
    • http://files.bayareanaturalbirth.com/uploads/1/3/2/6/132681690/vazidadolefufesifoke.pdf
    • http://files.cryptomillionairegame.com/uploads/1/3/1/8/131858108/6a0bdd2f3.pdf
    • https://cdn.shopify.com/s/files/1/0434/0675/3948/files/49378728167.pdf
    • https://cdn.shopify.com/s/files/1/0432/2702/1480/files/5292482276.pdf
    • https://cdn.shopify.com/s/files/1/0432/6853/8524/files/35034365515.pdf
    • https://cdn.shopify.com/s/files/1/0433/2647/2345/files/56445006048.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/neliloxetewonu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6014/3014/files/xuravijet.pdf
    • https://cdn.shopify.com/s/files/1/0436/0237/8915/files/32902472828.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovetutokukike.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1149/files/25993540778.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wawufomujemozinabewa.pdf
    • https://cdn.shopify.com/s/files/1/0439/2851/8824/files/weretulevuxufetutanotudat.pdf
    • https://cdn.shopify.com/s/files/1/0437/5127/6696/files/ripamavaguvolojef.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/63403106043.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6002/files/69460940842.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_off000061b0.bin
c5c5e8c12c1a2b0ca1d1bdfcbcc63f26921ce68f8d6c26c5c1e228cdcdc34c5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x61B0 5364 bytes
font_01_sfnt_off000073f6.bin
835950ca25b334df2adf2df8907a7c0a392d5325e22ca38304ebf0e640bd410f
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 10880 bytes