Malicious PDF — malware analysis report

Static analysis result for SHA-256 76757962e93dff8b…

MALICIOUS

PDF

51.7 KB Created: 2020-08-02 16:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 992bb99e4d74607556488582078d39fe SHA-1: 3c06a41e1cfc54fdb2388a115a92f235f9389b4a SHA-256: 76757962e93dff8b0bc6909bd587200eb5237419cca3eafdd926c63d8698ec19
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a mass of external links, many pointing to Shopify domains hosting PDF files, and one critical link to a known malicious redirector. This indicates a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.com/pify?keyword=ret+pally+talents
    • http://files.abrenian.com/uploads/1/3/0/8/130873804/473ec86e8.pdf
    • http://files.sarahbutcher.com/uploads/1/3/1/1/131164519/fupodefukobo.pdf
    • http://files.westernpneumatics.com/uploads/1/3/2/6/132681992/luzosowafesututu.pdf
    • http://files.elizabethcromano.com/uploads/1/3/0/8/130874141/pepibakivesabonanipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1597/7630/files/12452335266.pdf
    • https://cdn.shopify.com/s/files/1/0429/8804/4442/files/luluxi.pdf
    • https://cdn.shopify.com/s/files/1/0441/1251/1128/files/dagitopokotipub.pdf
    • https://cdn.shopify.com/s/files/1/0431/0391/2098/files/ketexewovixusibu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/human_biology_mader_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7407/files/wolosijubugojix.pdf
    • https://cdn.shopify.com/s/files/1/0432/9052/5849/files/59791770099.pdf
    • https://cdn.shopify.com/s/files/1/0435/2940/4567/files/kiwafaku.pdf
    • https://cdn.shopify.com/s/files/1/0437/2103/1832/files/52590643886.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4870/files/62453678856.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077ec.bin
359297e9abc2684689de791d4ea64945091472ac86131ed99cd5cac296a8d5b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77EC 4824 bytes
font_01_sfnt_off00008876.bin
69c3a3eec376a91c25b87ddd61972356d981de8e69a8992ad11f6dd55a78c77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8876 10284 bytes
font_02_sfnt_off0000abc3.bin
762c6fd61b37f89ea05a7418ba1edeaae5f7dc4bc30632d55baac616f76aea7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC3 16400 bytes

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