Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c1b661c6af3b6c…

MALICIOUS

PDF

36.3 KB Created: 2020-08-25 05:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2cb5a099a9da105fb2815a461de7db8 SHA-1: b58490a70091bd5ad8ce39b1a9d60dd2200f23fb SHA-256: 28c1b661c6af3b6c967cdb03443700ed979831b278faf4041edcfeec32747be5
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and keywords suggesting a lure for movie downloads. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to improve search engine ranking and distribute malicious content. 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.com/pify?keyword=avatar+2+dublado++utorrent
    • http://files.optimaot.com/uploads/1/3/1/6/131637104/kojivaxigivesuler.pdf
    • http://files.jlwarfieldministries.com/uploads/1/3/1/8/131858287/5173616.pdf
    • http://pufare.wall-in.com/uploads/1/3/2/6/132696067/guwidotajagipigadi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1773/1229/files/27266333824.pdf
    • https://cdn.shopify.com/s/files/1/0431/5247/4280/files/be_with_you_lyrics_and_chords.pdf
    • https://cdn.shopify.com/s/files/1/0430/3981/7890/files/camarines_sur_national_high_school_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/27709821676.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1424/files/mipibulavozotexaza.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/arqueologia_del_saber_michel_foucault_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0440/6244/1637/files/jajixekobarowerenepot.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_off00004c6b.bin
2585fbb0cf174870d581afef1a0c503023b9f96517ae8e8e4a819723aa0ac921		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C6B 4960 bytes
font_01_sfnt_off00005d57.bin
8c4b75422289b07f3d6db49b8ed24ff3873da3f0b25a523b681539ff4f87bbfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D57 12396 bytes

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