Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d705c71e0d13bd6…

MALICIOUS

PDF

45.6 KB Created: 2020-08-29 06:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dab180bf33ecb88763719e32f4acca36 SHA-1: 4d101ec2d79d4fca9561b22110e79c8ae582c57b SHA-256: 1d705c71e0d13bd6de2f9017e7d3346d0a9e5b68d39d74654d67e18a97727b79
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains a link disguised as relevant content, which redirects to a known malicious domain. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the embedded URL confirm this malicious redirection. The PDF also contains a large number of external links, suggesting a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier strongly supports the malicious verdict.

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=bell+hooks+pedagogy
    • https://static.usrfiles.com/ugd/b8c837_64d4c30f99834af4941a77d1891491d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_8710bf324c504b959ff9e2889b435479.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c1f3fb7df974c00b7f3a8f0f9b5b514.pdf
    • https://static.usrfiles.com/ugd/b8c837_f8472c99018f48b3b8afc86dcfd9bbd3.pdf
    • https://static.usrfiles.com/ugd/b8c837_21f9a8864bee4d519ff29d43c182de6d.pdf
    • https://static.usrfiles.com/ugd/b8c837_37a6778038a94cb880c68e7634b9672e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f5617e9edc844f0b7e917b06d927151.pdf
    • https://static.usrfiles.com/ugd/b8c837_b123b9d35bee43a28bac04eb065e97d7.pdf
    • https://cdn.shopify.com/s/files/1/0439/0001/0664/files/domino_s_pizza_menu_with_price.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/xikibodure.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/fuxakofuxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/jujoredegow.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8062/files/clock_and_calendar_aptitude_questions.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/all_casino_games.pdf
    • https://cdn.shopify.com/s/files/1/0461/5421/9683/files/gcse_chemistry_balancing_equations_worksheet.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_off0000754f.bin
af5cdbb7c2b82021a4adf3462e236b3c718854988fb17d26af9f5e24a232da08
pdf-font-stream PDF embedded font (sfnt) at offset 0x754F 5340 bytes
font_01_sfnt_off00008780.bin
7eb7ccd2b55b1ab3e5044a4d3b6d360cafdb389b10661587283da117f1b2790b
pdf-font-stream PDF embedded font (sfnt) at offset 0x8780 10080 bytes