Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef486ea0625d1796…

MALICIOUS

PDF

43.5 KB Created: 2020-08-24 03:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a21af3aa4b6c5a4cbb779f221dac19d3 SHA-1: a501e9db4cb75ed84f11bdbb66e19740a7f09fc3 SHA-256: ef486ea0625d17962bfcf272107600af027de831ac46fa29ba8d4652790c6592
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=chinese+chess++free+pc', is designed to lure users with the promise of free PC games. The PDF also contains a large number of embedded links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier 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.cc/pify?keyword=chinese+chess++free+pc
    • http://files.shcdesignsllc.com/uploads/1/3/2/7/132740488/bofobiraje_pusufejusuvewor_sejugef_sokolej.pdf
    • http://files.ayalalandalviera.com/uploads/1/3/2/6/132681985/533e0261a59.pdf
    • http://kizipa.jacobsden.co.uk/uploads/1/3/1/1/131164229/6913500.pdf
    • http://nesez.opt-hires.com/uploads/1/3/1/6/131637016/3664243.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/8759290738.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/lowes_lavale_md.pdf
    • https://cdn.shopify.com/s/files/1/0432/6237/8152/files/48034575435.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1333/files/adj_mega_hex_par_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/7205/2643/files/64787416671.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6444/files/regulatory_reporting_accountant_resume.pdf
    • https://cdn.shopify.com/s/files/1/0431/8117/9048/files/17146235802.pdf
    • https://cdn.shopify.com/s/files/1/0438/2638/0960/files/wamuvo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/comment_combiner_plusieurs_en_un_seul.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/google_docs_newsletter_templates_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1149/files/zafeni.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_off00006d96.bin
ca9ddf8382502a29f750df22c7750327f71f4e55e8bfb21af412f8c94e8bd7bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D96 4764 bytes
font_01_sfnt_off00007dc0.bin
8f8fb7a57db3e0a49a33f50f8a0b6445334c273bfde7e3e6ed7d0dbdb39f9548		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DC0 10436 bytes

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