Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bb76d31f89f5930…

MALICIOUS

PDF

36.0 KB Created: 2020-10-28 19:09:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 78d4c6dc462f399e7589929c01b61415 SHA-1: 3e17e50196159400903330522fe076eb02905e20 SHA-256: 8bb76d31f89f59300547371d44743133012237ec8742b8dfa3a034c9066cd3a4
124 Risk Score

Malware Insights

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

The PDF contains embedded URLs, with one identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text that appears to be a lure for educational content, directing users to the malicious URL.

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 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.
  • 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/aws?keyword=connecting+arabic+letters+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f8a548c7ff01.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/3392704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f875afcad7de.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/c9bf3e.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/laderote.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/gositupajonezi-pidugarigoba.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/c3a547f.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/ec08317502.pdfIn PDF document text
    • https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/mipebufetoxo.pdfIn PDF document text
    • https://rovumixonisi.weebly.com/uploads/1/3/4/0/134012407/faduxo_nugonupisemomo_rokilok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390092/normal_5f9134b43a423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/english_grammar_book_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/genetic_disorders_diseases.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/23845120940.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/wopifamijo.pdfIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/introduction_to_geometry_coxeter_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ca28d4-acff-45f0-b145-bbe96d9046ce/46874848325.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f7d2d5b-1a53-4ba5-8bdf-200e9c8a6b54/97743803321.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bc5d4d-80d8-44d6-8514-52696274e4e9/14888315357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c9fe9d0-bb20-4cbb-9457-5685ee311e61/69156708228.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_off00005192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5192 5260 bytes
SHA-256: 2f76434a40a1c83b867a72ccb4434a787ed57f89401779c0e3f8edf68e3cbdbf
font_01_sfnt_off00006380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6380 9164 bytes
SHA-256: e03099c2af60248f046965ab1e0e9ea06866042321d871239422edda0ff5a942

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