Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9b48a6a8f5caba…

MALICIOUS

PDF

40.5 KB Created: 2020-08-05 15:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 970cde7dc9d6c089172fe8f27fe30b2c SHA-1: 01bd169fe3ec18dd803771c71318912ade1d0530 SHA-256: ed9b48a6a8f5cabae4f57197e78b526ab7727570ecdf77c7bdfedae295fc907e
150 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and contains a high number of embedded links, including a critical finding of a malicious redirector. The primary malicious URL identified is https://ttraff.ru/pify?keyword=tabla+de+verbos+auxiliares+en+ingles+pdf, which likely serves as a gateway to further malicious content. The document body, though heavily obfuscated, also contains this URL and numerous other links pointing to external PDF files, suggesting a link farm or redirection strategy.

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.ru/pify?keyword=tabla+de+verbos+auxiliares+en+ingles+pdf
    • http://files.poeticspace.net/uploads/1/3/0/7/130739910/7749212.pdf
    • http://files.eringipfordfreelance.com/uploads/1/3/1/4/131453005/3119003.pdf
    • http://files.kaylacranston.com/uploads/1/3/0/7/130740517/8858f7.pdf
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/42882582151.pdf
    • https://cdn.shopify.com/s/files/1/0437/7300/1889/files/development_economics_masters.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/mhxx_brave_style.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/90671754078.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ridojunewosinojep.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/lijepowolowedomixukena.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1703/files/20374103510.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/8125/3535/files/zujebetekuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6513/files/935549433.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_off00005f27.bin
cf7fc212771f909286b052f48936a624f0880b16846db3fc8c68e55a9f121606		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F27 5424 bytes
font_01_sfnt_off000071ad.bin
124b7fbc4bfdd87009053cc1a38acb8e21f9a8235c4c39cbdcc4d224338e206c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AD 10520 bytes

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