Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbbccd2537da3610…

MALICIOUS

PDF

64.0 KB Created: 2020-11-25 21:41:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a3658623b5f42126a29959a479a2f17 SHA-1: 1d873b7c76bb84a2439659f2607232c125b8ae33 SHA-256: cbbccd2537da3610666092ce2b237aa3363d8c9f0f809738a4c4e1a840d15272
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of multiple external PDF links suggests a link farm or redirection scheme designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ggtraff.ru/strik?utm_term=ding+a+ling+ice+cream
    • https://cdn-cms.f-static.net/uploads/4486045/normal_5fb6aeee28eb5.pdf
    • https://cdn-cms.f-static.net/uploads/4402720/normal_5f9a302c56a88.pdf
    • https://cdn-cms.f-static.net/uploads/4370074/normal_5f8cb93eebb4a.pdf
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/bigunurusipota_vovavubavuw_malolipesafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/belopudevuzuza/chapter_8_study_guide_answers_history.pdf
    • https://s3.amazonaws.com/bupaxomu/goober_peas_country_store_boone_nc_hours.pdf
    • https://uploads.strikinglycdn.com/files/7b2dcfe6-9f43-4148-bf79-4f36e1571e24/unblocked_games_75_slope.pdf
    • https://s3.amazonaws.com/vazisi/sociology_of_education_a_critical_reader.pdf
    • https://uploads.strikinglycdn.com/files/026fc12e-b1c0-4f7d-96f7-bb77972d9e02/nike_lifestyle_shoes_black.pdf
    • https://uploads.strikinglycdn.com/files/45690537-57ac-40f9-b7f2-bb4f4062c180/nenuxebinoberixawop.pdf
    • https://uploads.strikinglycdn.com/files/daf46fa0-6e79-459b-bbfc-746ac1b5a98c/kudovireterug.pdf
    • https://uploads.strikinglycdn.com/files/8eab9719-569c-4943-936c-00eb6d42eb03/wazusulaxewako.pdf
    • https://s3.amazonaws.com/sajatofubote/best_live_stream_app_for_android_box.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_off0000bf55.bin
fc47c687fc2c2db4dd7974de844012d53b37aaa8ff35a39829d62cad6e682320
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 4940 bytes
font_01_sfnt_off0000d018.bin
7ad41c52357290458737218204cdd9e6036247ae3ce39c6ac4ecade1ae9c56d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 10456 bytes