Malicious PDF — malware analysis report

Static analysis result for SHA-256 7244bd62f78dbc4f…

MALICIOUS

PDF

32.6 KB Created: 2020-08-31 05:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34dd9f201fb8604f03f0756ec2360bcc SHA-1: e7b1d518c67952c327edaae090e49a8d2b79123b SHA-256: 7244bd62f78dbc4f8bfc59284545016835309e4e46c96536f3d47f14de0653b8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=vscode+couldn%2527+t++intellicode+model'. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which point to benign Shopify files. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same malicious URL, suggesting an attempt to lure the user to a potentially harmful site.

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/wix?keyword=vscode+couldn%2527+t++intellicode+model
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1664/0919/files/powerpoint_website_mockup_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/9780/8279/files/45106331439.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/nuxuxaluravigukakezisabuz.pdf
    • https://cdn.shopify.com/s/files/1/0459/8815/1458/files/96233399206.pdf
    • https://cdn.shopify.com/s/files/1/0434/9696/4261/files/aircraft_structures_for_engineering_students_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3387/8940/files/11931270230.pdf
    • https://cdn.shopify.com/s/files/1/0435/7193/7438/files/ulala_idle_adventure_guide_attribute.pdf
    • https://cdn.shopify.com/s/files/1/0438/1055/4016/files/descriptive_geometry_2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c7f8045d3244e7bbbeaa3b1f5973342.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_4563bdb6dfa949b99572b92a05b2bc17.pdf
    • https://static.usrfiles.com/ugd/a298ce_fdf5b06883a34e63838b6e66151ee5a9.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004369.bin
da4e91e83f170bac29d19304ae377cb4d2d6bb7fdcf51a11d49317e912365b2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4369 4780 bytes
font_01_sfnt_off00005398.bin
258743e78c60a5a8b6601523d0d952344e466692e6c40b30ff64ccef40b062a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5398 10016 bytes