Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad6d8f8838bc88b…

MALICIOUS

PDF

43.3 KB Created: 2020-08-24 17:18:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1c4641f3d81c226a08dd397dc60171e SHA-1: fb8c4e0637342e2dd9446409618a079f72cfc291 SHA-256: 9ad6d8f8838bc88b624c76b220df9f59cf00107911592876bf664652bff1de70
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, contains text related to a user manual and includes the malicious URL, suggesting a lure for users to click through to potentially harmful content. The ML classifier strongly indicated maliciousness.

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=braun+4045+coffee+grinder+user+manual
    • http://fubugapoz.upscaleconsignmentsale.org/uploads/1/3/1/3/131383791/35429.pdf
    • https://cdn.shopify.com/s/files/1/0445/6821/5716/files/categorical_data_analysis_agresti.pdf
    • https://cdn.shopify.com/s/files/1/0429/9993/9235/files/bojomovitujekutekat.pdf
    • https://cdn.shopify.com/s/files/1/0434/5298/9605/files/44036319198.pdf
    • https://cdn.shopify.com/s/files/1/0443/5968/0156/files/a_flat_stomach_asap.pdf
    • https://cdn.shopify.com/s/files/1/0440/8311/8232/files/93496174422.pdf
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/roblox_script_executor_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/8448/9631/files/wowexer.pdf
    • https://cdn.shopify.com/s/files/1/0437/8394/6401/files/singer_66_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/4235/4853/files/16515444998.pdf
    • https://cdn.shopify.com/s/files/1/0431/5450/5882/files/french_alphabets_pronunciation_audio_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/73357945870.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/
    • https://cdn.shopify.com/s/files/1/0436/5585/6281/files/roblox_script_executor_do

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068c6.bin
a582b9b0857ae9be9bdcf3b78d830ed9ed61d5ff0c4370150b376dc0a79659b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x68C6 5744 bytes
font_01_sfnt_off00007c3f.bin
1bab0b4ee043b97fc6d2c81f222aff7e720364bb8ad8a955dfd0e02bfbd23db6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3F 10484 bytes