Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b91ebca0c4b906a…

MALICIOUS

PDF

48.6 KB Created: 2020-10-26 11:49:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: edac2609152249b9b72020539defd625 SHA-1: db2ef2c4d09c516d8864f9b5921bf08a249785ef SHA-256: 3b91ebca0c4b906af8fe102ccfdb62a9610e1d1da842e7c05877693e5b36a56f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of external PDF links, many of which appear to be generated for SEO purposes, and a visual download button lure. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the redirector link suggest an attempt to lead the user to a malicious site, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cctraff.ru/strik?keyword=supply+and+demand+trading+strategy+pdf In PDF document text
    • https://bipinutafo.weebly.com/uploads/1/3/4/3/134358532/0612d413422.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/dekefomivupe-kovak-talajonipa-fedebiraroz.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/komexirokomejojake.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/voxodibujufu-gusojowubozalat-jijiruzad-sadovuvu.pdfIn PDF document text
    • https://fezuxikazosulav.weebly.com/uploads/1/3/1/3/131398093/3426c1.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/afd91.pdfIn PDF document text
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/rarikavabemis_nadavutidur_nutalelodate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5587/3190/files/reddit_ncaa_wrestling_streams.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3543/3882/files/tonurasut.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2578/5255/files/rwby_manga_anthology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9235/2928/files/virginia_woolf_moments_of_being_read_online.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9372/1255/files/64319803617.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/0667/1032/files/1000_basic_english_words.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/9780/9830/files/speak_up_3rd_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/dr_who_arch_enemies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2858771-831d-4746-b066-59b3ba25cbf4/evil_tracer_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e6ee0d-9f36-4267-9ea1-22a2f41d03c0/rupoxuwerekodageraxute.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d513cac9-9745-4901-8c76-9b9c24fcb9ac/xewojifesobis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3feb9f4a-d263-4d96-9929-2b425d80377a/88647527432.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90462d7c-fa4f-43ff-a6a2-21874bfebc38/rebexorobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/737e277b-5e6d-473f-bca6-b74adc6e93be/3873927814.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007d64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D64 5568 bytes
SHA-256: 8ce292381f9921549d791f563aca826736731fdc3286362de94b31da8e58220f
font_01_sfnt_off00009044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9044 10740 bytes
SHA-256: 54caba139d0e9d3a260fc9bbfb7ee405c963296541f4263c18f03527813a08bd