Malicious PDF — malware analysis report

Static analysis result for SHA-256 784dc0cfb03ee915…

MALICIOUS

PDF

40.3 KB Created: 2020-08-17 08:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2800fc668c87a02a188878a4c2cde71 SHA-1: 8eda807d12852744abdbfaa6ee316bd7a8fa5184 SHA-256: 784dc0cfb03ee915a48e54c6df8c81a3aff7123f5ece6dc51f7e67ba29cccc2b
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.cc/pify?keyword=arne+naess+libros+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the book 'Arne naess libros pdf' and the URLs, suggesting a lure to external malicious content. The ML classifier also 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.cc/pify?keyword=arne+naess+libros+pdf
    • http://files.cannotbeboardered.com/uploads/1/3/0/9/130969678/684e6aeb582.pdf
    • https://cdn.shopify.com/s/files/1/0430/3385/4103/files/91998210878.pdf
    • https://cdn.shopify.com/s/files/1/0431/2943/8370/files/rokosujigumaluvexosavo.pdf
    • https://cdn.shopify.com/s/files/1/0430/6308/3162/files/nokowolagulafumirudokovo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/82926779166.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13002849425.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/stop_form_submit_on_enter_jquery.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/lolesok.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3238/files/bujisoreruj.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/18053682718.pdf
    • https://cdn.shopify.com/s/files/1/0437/7886/7354/files/22943243250.pdf
    • https://cdn.shopify.com/s/files/1/0446/2352/8099/files/fibixemepigenososozudij.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/autocad_basic_commands_download.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_off00005fc5.bin
921edf6b4f30b09121300482f2eaba9880b09f8d554229b4a87dc42c6fb27c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FC5 5164 bytes
font_01_sfnt_off0000714e.bin
e02c3e075b0b019b403b0aa3c41e8af328e7c981cf7eecd0e076f9d4ceb4c356		 pdf-font-stream PDF embedded font (sfnt) at offset 0x714E 10424 bytes

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