Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca50fc5c242900d8…

MALICIOUS

PDF

52.2 KB Created: 2020-10-16 02:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: c761a9205e714080718ea0f5f6b41754 SHA-1: 63b8200c2779ef5b30d4ed38ea5ae4424c900698 SHA-256: ca50fc5c242900d8442cd22eb83fa5cbee913d44ffa1af3ecf8740fe9284d301
184 Risk Score

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.
  • 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://gettraff.ru/pify?keyword=syllabus+of+upsc+cse+2020+pdf In PDF document text
    • https://site-1040670.mozfiles.com/files/1040670/kinoj.pdfIn PDF document text
    • https://site-1039476.mozfiles.com/files/1039476/zekoxut.pdfIn PDF document text
    • https://site-1037868.mozfiles.com/files/1037868/16983821924.pdfIn PDF document text
    • https://site-1040056.mozfiles.com/files/1040056/26585632330.pdfIn PDF document text
    • https://site-1037081.mozfiles.com/files/1037081/96355433676.pdfIn PDF document text
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/bododuxesotifi-wobavenizegu-doloku-pusodud.pdfIn PDF document text
    • https://topodomero.weebly.com/uploads/1/3/2/6/132696018/9e901e0.pdfIn PDF document text
    • https://femitinekabel.weebly.com/uploads/1/3/1/4/131437683/752275.pdfIn PDF document text
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/9512461.pdfIn PDF document text
    • https://jemiwuwavaza.weebly.com/uploads/1/3/0/8/130814288/bibesekukemugedovofa.pdfIn PDF document text
    • https://bijifejutumaxob.weebly.com/uploads/1/3/1/3/131381781/c55a651cea8a42.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/3532345.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/zirilapalir-bisojexowesomes.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/zezalu_lidoj.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/diren.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/72c5ae14-311b-4c50-bcff-3cc5da987b81/fexejugewivuwonuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e3b9d9-879b-4e20-bdbb-d6251877abe9/74191764173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7130de14-c5b6-4d6d-89c0-efe2eeba95ab/18158425635.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000785b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 5672 bytes
SHA-256: 6863f007efae02d9183b9c7a84377e2d91cfc8c7283fd66b408528485763d148
font_01_sfnt_off00008bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BBA 10124 bytes
SHA-256: 63509c166f765c874be59fb6aa5380ea94fe494405c6b728072f886460d73ead
font_02_sfnt_off0000ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8F 16096 bytes
SHA-256: 38f28e66589aaac1d30fe7d2e7c00d3eafcba6df844a1e68f599903ca29b1fa2

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