Malicious PDF — malware analysis report

Static analysis result for SHA-256 d21e133cca7967e3…

MALICIOUS

PDF

51.1 KB Created: 2020-08-16 22:37:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 154272e67ca1a35b6e29a3d45db6fa34 SHA-1: 4f94f8a04e1c7972ae8cf065384c174b65a99156 SHA-256: d21e133cca7967e3ef9f7220ab0fa9a40b100132a4c2367b640cc68e588bc4db
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. This link, 'https://ttraff.cc/pify?keyword=maths+probability+worksheets+gcse', likely leads to a malicious site. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to various PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=maths+probability+worksheets+gcse
    • http://files.ashleighlleiter.com/uploads/1/3/1/4/131483830/f399f410886.pdf
    • http://files.megageniussupplystore.org/uploads/1/3/1/4/131408439/b99104af99.pdf
    • http://files.norcalsmartvestorpro.com/uploads/1/3/2/7/132710655/96f0fa3.pdf
    • https://cdn.shopify.com/s/files/1/0427/8901/1612/files/xilitadifijobixotok.pdf
    • https://cdn.shopify.com/s/files/1/0449/2309/3147/files/icp_product_registration.pdf
    • https://cdn.shopify.com/s/files/1/0446/7798/8505/files/organic_livestock_farming.pdf
    • https://cdn.shopify.com/s/files/1/0440/5736/2597/files/l2_network_engineer_roles_and_responsibilities.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/24375498268.pdf
    • https://cdn.shopify.com/s/files/1/0446/1376/3235/files/cellular_biophysics_transport.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6365/files/2015_chevrolet_camaro_v6_performance.pdf
    • https://cdn.shopify.com/s/files/1/0431/8537/3333/files/koxazol.pdf
    • https://cdn.shopify.com/s/files/1/0430/4837/0333/files/gisomekixez.pdf
    • https://cdn.shopify.com/s/files/1/0432/5860/9817/files/karma_conf_js.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_off00007af9.bin
5b53a3121165862c8405f3b7577c0bda3fd810cd0561c97e7b9749e5bcc6f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF9 5280 bytes
font_01_sfnt_off00008d1e.bin
9a72b7ce5c8ba80f08a672b894c90965b05c086c80e6498f115c572a8c9a7614		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1E 10728 bytes
font_02_sfnt_off0000b195.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB195 4324 bytes

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