Malicious PDF — malware analysis report

Static analysis result for SHA-256 993e348c4e5f3105…

MALICIOUS

PDF

45.4 KB Created: 2020-07-29 12:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0355fa30f40676492134b055c696c3d4 SHA-1: f55c6cfce19a950c7fa172ad36e4a92cf0e28b7b SHA-256: 993e348c4e5f31052df05bf6f2f205f43e84ddf3790343ef30e523856d6e81c2
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 pointing to ttraff.com. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded links, many hosted on shopify.com, but the primary malicious link is to ttraff.com. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and appears to be largely binary data, making its direct content unreadable, but the presence of the malicious URL is sufficient to determine the attack pattern.

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.com/pify?keyword=arithmetic+and+geometric+sequences+zambak+pdf
    • http://files.rhondastruminger.net/uploads/1/3/0/9/130969728/7108549.pdf
    • http://files.fanyangresearch.com/uploads/1/3/0/7/130740480/8766197.pdf
    • http://files.grainsfamilymarket.com/uploads/1/3/0/7/130775647/tusar-kagenimatijukej.pdf
    • http://files.thefrostedsugarcookie.com/uploads/1/3/0/8/130813616/gapeboleka.pdf
    • http://files.rho
    • https://cdn.shopify.com/s/files/1/0428/0107/0247/files/22577591586.pdf
    • https://cdn.shopify.com/s/files/1/0431/0083/1905/files/gubipadirev.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5274/files/nuxotuzijisuwise.pdf
    • https://cdn.shopify.com/s/files/1/0434/5220/3161/files/denejaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/6371/3690/files/davopipimevijupoxilipus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5330/files/80911574711.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/banefidofekadozimodomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/sesejufedipize.pdf
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/65307005845.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/20935277570.pdf
    • https://cdn.shopify.com/s/files/1/0435/0686/0187/files/73460617782.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_off000071e2.bin
da1b6d38e3b90c5255025cc5a46cb79100fa109174c4dcd7575c3c0311583cd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 5788 bytes
font_01_sfnt_off0000855f.bin
a15368b29147310484c454e7b86a1a5d59c73cd1433f382d083d9aa71052f0d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x855F 10116 bytes

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