Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eea4aa4288b1c3e…

MALICIOUS

PDF

37.0 KB Created: 2020-10-21 00:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4f8bc284d0dd309d17a06df06e4b3da9 SHA-1: e077687a523e1257c554d3a97d30f7d60dc00fa1 SHA-256: 3eea4aa4288b1c3e5afe90b24177881bfbc4ee01ed819eded0921d4250c016b6
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to billing and journal entries, suggesting a lure. The presence of numerous external PDF links, some hosted on disposable infrastructure, indicates a link farm designed to obscure the ultimate destination and potentially distribute malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wb?keyword=billed%20customers%20for%20services%20performed%20journal%20entry In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378605/normal_5f8d961257d38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f8a123955b1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366312/normal_5f872e7eb85ca.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/deneb.pdfIn PDF document text
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/valipuku-pinimaja-votipebap-falevutu.pdfIn PDF document text
    • https://bogadisosupotaj.weebly.com/uploads/1/3/0/7/130776541/1458682.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/bozobemazu_xilubojipikex.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/rivuson.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372384/normal_5f8baeee45bf1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f8f55af97ae4.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/wogup.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/runinugewafavulexewuluju.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/neet_biology_chapter_wise_questions_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/323ccdc4-d431-48a9-885d-61090a710e10/xaluvajogulibemivijadule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6017ff24-5403-4050-9ac9-3d23dd6fce5a/86921275124.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/271eb060-3e24-40f5-9f0d-89d9fb60cc26/13250385818.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df37ed1b-745e-426b-9ea5-0d64ad322a51/la_la_land_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96802e78-5878-4809-9c2c-6e98a8c492c7/89130964289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0292adb-685c-464e-9734-8e9778381fa0/malusip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2792f302-9c30-4df4-a2cc-9c9b2a5472c1/19850407205.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1441fd3-9fb6-4b5a-be1b-20b66c1506c0/nixubalumepaxuv.pdfIn PDF document text

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