Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9772b1f6802541f…

MALICIOUS

PDF

48.7 KB Created: 2020-08-26 13:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b1095754f0e3088877765ee42173d6a SHA-1: cab5eb69f416fdf7470ac01d36737fdf1e9e455d SHA-256: a9772b1f6802541f8f194b30a3278f33165cb9617bc1789167d83ac69abb73b0
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to external sites, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=jerarquia+de+operaciones+aritmeticas' and numerous other PDF links, suggesting a tactic to drive traffic to potentially malicious content. The heuristic firings confirm the presence of malicious redirector links and a link farm within the PDF structure.

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=jerarquia+de+operaciones+aritmeticas
    • http://files.avsone.com/uploads/1/3/0/9/130969472/bodurizoberanog-modomebik-difamajosenef.pdf
    • http://zebeziba.prettylittlebath.co.uk/uploads/1/3/1/4/131454106/zeritugorebiza.pdf
    • http://minitike.cancercoloring.com/uploads/1/3/2/6/132683001/kajex_botulakosivola.pdf
    • https://cdn.shopify.com/s/files/1/0433/3685/9813/files/21126705344.pdf
    • https://cdn.shopify.com/s/files/1/0441/2358/6712/files/android_smartphone_secret_codes.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/62654677968.pdf
    • https://cdn.shopify.com/s/files/1/0429/5652/1631/files/30419374960.pdf
    • https://cdn.shopify.com/s/files/1/0432/3167/4535/files/bedizalivoj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5175/3380/files/lucida_blackletter_font_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/5064/6169/files/good_charlotte_good_morning_revival.pdf
    • https://cdn.shopify.com/s/files/1/0431/8976/4245/files/bass_guitar_chords_file.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/6443521645.pdf
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/bapisobozupigokiw.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3e.bin
a62885b9fdf39c8436bcc76cf836b4ed9ca89db4385d1708b90c5c086fec5610		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3E 5304 bytes
font_01_sfnt_off00007126.bin
27ceaef4956716aabc4a71890dddedf57872fbde45cf98d8d4ccfdfbae9ffff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7126 14664 bytes
font_02_sfnt_off00009ee6.bin
19cc87a61af1ffec9583344a7275f6d3812bd596e08e219237328c0503819c41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE6 16080 bytes

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