Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93b276ab49edb44…

MALICIOUS

PDF

49.0 KB Created: 2020-10-30 19:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1c682e2acb3743efb40fcc0a0e0fb727 SHA-1: a59177fa7ab9cd194125a909c9300bf3149bd13a SHA-256: c93b276ab49edb44eeeb6ee912c65b7de92318931cb7e12e647fdb931552f3c8
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, disguised as study guide answers. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic and the ML_NYX_PDF_MALICIOUS flag strongly indicate malicious intent. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector, suggesting a phishing or scam attempt.

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.club/123?keyword=world+geography+semester+2+exam+study+guide+answers In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d8725e5-959e-42a2-be79-b035dbcc2e95/2538078005.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a5168a1-f058-477d-9c8b-6c469de73fc1/7824876568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa36762-1382-419e-bb3e-722de64b0e94/79497840770.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6323e43-d34a-4c4e-a0f8-74eae9b9489b/91941121623.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e28d1154-ee18-447f-87d1-d3d0c780d26d/logeligaliwibuwetuzupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8bf1a7-6547-46fd-894d-8dcdff387595/lugusupafeguwesafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ff5034-6516-4ec0-944c-ca3d703e92a3/20053454714.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555a89fd-87b5-4e99-85e2-1136e28a67ce/72494066310.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6502/4416/files/advanced_data_structures_and_algorithms_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70d8a9ba-b2ce-4e5e-8feb-b7ec41ff8c91/96500491681.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_off0000732f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x732F 5780 bytes
SHA-256: 08d95aab4fd7cd1ff44543eeefb54dfcecf62aba310a2608b985cbd31e6edc85
font_01_sfnt_off000086d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D3 14516 bytes
SHA-256: f05347214c1bc49a7259af7f8c0ba38cf55189f2b42e67ae5e70a621eb5560c6

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