Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d5c088ef1e1d61…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 17:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d2d617f0275a44ba86ac1f9a154837 SHA-1: c92b9a4f1feedbe4cc55d3cfe6b3a0b6576cefd2 SHA-256: 98d5c088ef1e1d61fe916774f8d6fdce5a304932b90ad92e8fa9bb9ebf8b8b5a
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The primary malicious URL is https://ttraff.com/pify?keyword=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+pdf+th%25C3%25A0nh+%25E1%25BA%25A3nh. The document body, though heavily obfuscated, contains text related to PDF conversion and the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent. 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.com/pify?keyword=chuy%25E1%25BB%2583n+%25C4%2591%25E1%25BB%2595i+pdf+th%25C3%25A0nh+%25E1%25BA%25A3nh
    • http://files.carlosorta.com/uploads/1/3/0/8/130814877/6995631.pdf
    • http://files.makingyourlifecountradio.org/uploads/1/3/2/3/132302764/7082808.pdf
    • http://files.festival-calendar.com/uploads/1/3/0/7/130775282/5b9b9ea8f0b7.pdf
    • http://files.parkvilleautogroup.com/uploads/1/3/1/8/131871780/62a82bda62.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/kuvekulebu.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7173/files/bitzenburger_fletching_jig.pdf
    • https://cdn.shopify.com/s/files/1/0430/0744/3103/files/46974482643.pdf
    • https://cdn.shopify.com/s/files/1/0432/7283/1134/files/76216222644.pdf
    • https://cdn.shopify.com/s/files/1/0434/0993/2440/files/34909272875.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30899714004.pdf
    • https://cdn.shopify.com/s/files/1/0437/4387/1127/files/61524818882.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6250/files/vocabulary_for_ielts_academic_writing_task_1.pdf
    • https://cdn.shopify.com/s/files/1/0434/4951/6199/files/iskender_pala_su_kasidesi.pdf
    • https://cdn.shopify.com/s/files/1/0444/4323/8567/files/difference_between_skills_and_abilities.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/gosefubuzamoj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3514/7933/files/ruparirinexu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1165/4307/files/zikupusivuwigakegixokowed.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_off000060b2.bin
f4a41802118586c4a32be413f219ebd9ca22d0894104f44d26e74119bbd57390		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60B2 5684 bytes
font_01_sfnt_off000072a5.bin
33834f6e9f198a1ff64f1bf41b525f518c16ac19f1d6fbcd09f0ff0bb5310702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72A5 21944 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.