Malicious PDF — malware analysis report

Static analysis result for SHA-256 a98d7e5be4147535…

MALICIOUS

PDF

49.5 KB Created: 2020-10-21 03:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 9f068b1265d23de7ff33b65e35b44dd3 SHA-1: 07e98ab4c5c05cbf2d243a4fb74a03e68b416217 SHA-256: a98d7e5be414753544c99f3c9f169147ea4b42f8abbf7b4070505047e47eeb5a
184 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to disposable hosting services and known malicious redirectors. The heuristic firings indicate this is a malicious redirector and a link farm, suggesting the primary purpose is to lure users to malicious sites. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for obfuscation or redirection, hence the inclusion of T1059.007.

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://cctraff.ru/wb?keyword=talos%20principle%20a3%20star In PDF document text
    • https://vixeroniwemeful.weebly.com/uploads/1/3/0/7/130740086/5536424.pdfIn PDF document text
    • https://juragubiv.weebly.com/uploads/1/3/0/8/130874328/a78ed2779e9a8.pdfIn PDF document text
    • https://dubuzosokiboxof.weebly.com/uploads/1/3/1/1/131163723/1beae7928cd13.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/6b1340376.pdfIn PDF document text
    • https://fodezamu.weebly.com/uploads/1/3/1/4/131407453/biwerop.pdfIn PDF document text
    • https://xujaxivef.weebly.com/uploads/1/3/1/4/131438557/2232723.pdfIn PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/de1ab798a404.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/143a2d14-fc1c-429a-880e-7941e2ef7f59/67275142488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e140726f-c7d3-488e-9fe4-9563ceecc1b2/84869431985.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81026051-0901-45e3-a88d-a6c00632fdd4/pigatezirot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77da06dd-d1d8-4bd4-ad87-926e2f2ec441/19279353554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87b1245-b2b9-41a2-86f1-af2f188ca4f1/maworubudikinatazurusefa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6f6524e-bcd2-4162-89a7-2b92095e45eb/16348992848.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/520a2e3f-fa8b-4151-84f5-b29beddd9407/midepuxidimexazit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9fa6770-ef0f-45f5-bb1a-3eb020170faf/gedekuzuvowudura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc20dbad-835c-40fb-82a8-154bfbef0c69/jeketorizuzawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5afa8738-cfdc-4f75-a3fb-67c1a07aac71/21675008609.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/ashanti_golden_stool.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/67156442445.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_off0000669a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x669A 5040 bytes
SHA-256: a957a980f242f974eded5a53b877fad7b21d319f0f1c992db4864f6894f63a49
font_01_sfnt_off000077cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77CC 13072 bytes
SHA-256: ecb464cfc51e7148795051946ed9e0cef7e3c506ebe5e2c76608facaee9663cd
font_02_sfnt_off0000a22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA22E 16196 bytes
SHA-256: 536551dee6876366cf8a5d925709f0aaa9c9f58e9963f4e154d0e8cf77de6ee3