Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ab584a9b2fdd0f…

MALICIOUS

PDF

58.7 KB Created: 2020-10-18 10:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: c9b6223ed450100fb39a441f8fc4522a SHA-1: e71c41db5cbb947e08dbe8118216c466df697a5e SHA-256: d6ab584a9b2fdd0f54b22b0b4fbf1054ec74f06db142d0dd5cc8830addb23ef1
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The embedded URLs, such as 'https://cctraff.ru/123?keyword=aldehyde+and+ketone+ncert+solution+pdf', are likely part of a phishing or scam campaign. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to direct users to potentially harmful content, masquerading as educational material.

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://cctraff.ru/123?keyword=aldehyde+and+ketone+ncert+solution+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4366366/normal_5f870e323af51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367289/normal_5f87416d10c80.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8b45eb00666.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366316/normal_5f87dacf810fb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366311/normal_5f873fba2de86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366346/normal_5f8766775721f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f8b7dc503426.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366010/normal_5f8bbe5fa09d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369308/normal_5f8b591257643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367922/normal_5f87620e509e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_5f8bd5f300933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f891cf9d6901.pdfIn PDF document text
    • https://wefolukozik.weebly.com/uploads/1/3/1/4/131406413/gokasejuri_zekipugifidapem_loronimos_gajefe.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/devuxupujikeninaferi.pdfIn 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/8a336598-d54d-41be-bb03-2d00d80b3ab4/popper_jr_game_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23c3d22-d83f-431a-b001-d92d41a21ce3/lotugorabefukatotule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e026485a-347a-4659-9435-18829dccd63f/93821362862.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e31d176-d9c0-4294-8eb9-ebadc6cd0b59/mojesaromibetepam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54322f1d-e720-4a56-a898-c1695a7c3563/70578505953.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47677b16-1f30-4028-b71d-ea8a3b6be880/68937869372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9b87ee-6748-436d-8cf5-57f75606f996/vulosegovago.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000bf4a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBF4A 18384 bytes
SHA-256: 8fed3bf8aaef84ced90217989a4a100d7f41968029bc9f1a556289a6f8013409
font_00_sfnt_off00006d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D99 3200 bytes
SHA-256: 3621b82c89c8baa7805649a1880fcbec603ffac46ff9d30dc37425aa76907fa0
font_01_sfnt_off00007915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7915 5396 bytes
SHA-256: 430d4b20f1e17ed0e002b6edd19ec1b31326e079bb06551982d40d0d1a0fda27
font_02_sfnt_off00008b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B6F 16740 bytes
SHA-256: 0eb28a3665275e0d6f73b33d8973001400bc1a26b8ec56a4ff184fda1d139365