Malicious PDF — malware analysis report

Static analysis result for SHA-256 41321bb9c732f6bc…

MALICIOUS

PDF

42.7 KB Created: 2020-08-19 07:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb4a53d760ecc89c07ede99e546c7bc6 SHA-1: bc44a850c0f3ed004f5b9cf8eb4432551b916b62 SHA-256: 41321bb9c732f6bc40285efba57d7aa7c1d2f65b92a626182c4e62393c82c84e
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including one pointing to a known malicious redirector. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.cc/pify?keyword=excel+sheet+mirror+image', suggesting a lure to trick users into clicking a link related to an Excel sheet. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links to external PDFs hosted on Shopify and other domains indicates a link farm designed to obscure the malicious destination.

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.cc/pify?keyword=excel+sheet+mirror+image
    • http://pipegetep.graceandknowledge.net/uploads/1/3/1/6/131606407/vodale.pdf
    • http://files.doorwaytodignityabuserecovery.com/uploads/1/3/1/4/131409017/buwifolukupodofivo.pdf
    • http://files.karenyonkersmusic.com/uploads/1/3/1/3/131384135/8244322.pdf
    • http://files.lasolascapitalarts.com/uploads/1/3/2/6/132696330/nuwomukilaweji_fobusuroma_vimiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/9548/1754/files/bitobal.pdf
    • https://cdn.shopify.com/s/files/1/0432/6014/9910/files/selozepubokeba.pdf
    • https://cdn.shopify.com/s/files/1/0431/8140/8420/files/22626116367.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/jironinedeviwapemogam.pdf
    • https://cdn.shopify.com/s/files/1/0437/9751/2354/files/samude.pdf
    • https://cdn.shopify.com/s/files/1/0432/3174/0071/files/bedsheet_warehouse_sale_2019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baludugosutagaxoreforodul.pdf
    • https://cdn.shopify.com/s/files/1/0440/6955/2293/files/putexuxokinibapivibif.pdf
    • https://cdn.shopify.com/s/files/1/0428/8308/8547/files/60120905603.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9499/files/8279834480.pdf
    • https://cdn.shopify.com/s/files/1/0431/7564/1247/files/54179042520.pdf
    • https://cdn.shopify.com/s/files/1/0433/8060/5077/files/carboxylic_acid_reactions_summary.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_off000067cb.bin
9229e962a807ad57be877963de08896b61dbde39b463853b7ed8af8ceb968064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67CB 5236 bytes
font_01_sfnt_off00007976.bin
a2955270dbe7060d628e7b14239bc6b56f065bd6b71339aef0f4882f98a7d293		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7976 10780 bytes

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