Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04230fd105a78f4…

MALICIOUS

PDF

60.0 KB Created: 2020-08-04 02:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038f50d9417f3a258984a2dcc16e5bcb SHA-1: 2f7bac2e466737b92d39fc8396154a17810b7d92 SHA-256: e04230fd105a78f4920cc24d807ae5e581ad9d9c61b31e0884af197b8fe4ddcc
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector URL, which is a common tactic for delivering malicious payloads or phishing pages. The document body, though heavily obfuscated, contains text suggesting it is an exercise PDF, likely a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly indicate malicious intent, with the primary IOC being the redirector URL.

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=verbos+auxiliares+en+ingles+ejercicios+pdf
    • http://files.elliottsmithdiscography.com/uploads/1/3/2/6/132683069/zaxawupivi_bajagusanajel.pdf
    • http://files.lagrangehorse.com/uploads/1/3/1/3/131383665/6dd7bab24de8616.pdf
    • http://files.concretesliderules.com/uploads/1/3/0/8/130813988/fabomupa-roguxoperesu-tekezot.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/99131818616.pdf
    • https://cdn.shopify.com/s/files/1/0432/1234/1416/files/nelaragivojiso.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/mesunupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/77011107478.pdf
    • https://cdn.shopify.com/s/files/1/0428/7175/0822/files/koguli.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/72290952875.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/dewaxidesodedumanivavusog.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7884/files/86958230812.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/didiselugazumera.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/73353907722.pdf
    • https://cdn.shopify.com/s/files/1/0435/7367/4142/files/83328035630.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_off0000a890.bin
6d94fe0748717b04f1d3a8957c6f5a805f94cb38d89ab3c6e1b9c64781caff82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA890 5572 bytes
font_01_sfnt_off0000bb9e.bin
eb4b7ecd4b71dddb18ec70452feb50699efa3398a71bd94e4d630a6310e37fff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB9E 11428 bytes

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