Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb4585593bed8116…

MALICIOUS

PDF

40.7 KB Created: 2020-11-05 02:11:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b968c10de1000d8ab709dc57e1ba40a4 SHA-1: c601fe31e33db583001b536371f968c9537d7233 SHA-256: eb4585593bed811645a624672fb37c54dd2623074508a411e058093360f206aa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious due to its structure, which includes a large number of external links pointing to various domains, characteristic of a link farm. One of the primary links, 'https://ggtraff.ru/aws?keyword=biology+eoc+study+guide+florida', is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains this URL, suggesting the document's purpose is to redirect users to malicious infrastructure under the guise of providing a study guide.

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://ggtraff.ru/aws?keyword=biology+eoc+study+guide+florida In PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/2446fef6.pdfIn PDF document text
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/jenadatutovabi.pdfIn PDF document text
    • https://kagilovudugavap.weebly.com/uploads/1/3/1/1/131164538/wekakevu.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/kulijikasege_likodime_fopesuxererod.pdfIn PDF document text
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/nowesaziw-novida-fadadu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388062/normal_5f9638c49c46e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403681/normal_5f9ccfdbc270c.pdfIn PDF document text
    • https://tadeganerusoza.weebly.com/uploads/1/3/1/4/131438541/ximaboriti-panojoxa.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/c437f4.pdfIn PDF document text
    • https://tupirirelaw.weebly.com/uploads/1/3/4/6/134620561/9011686.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/1889435b-4c94-4042-b014-770c13acad19/talid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa984bf0-9a88-4917-9bac-85d2a3606c3d/rezipogugaduxizas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80daa4a9-397b-43e9-ac0c-7ea63a7b298d/74214032591.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6439306-49a2-4c14-894f-e4adae49439c/84860017158.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/892d4ec1-e56d-46b7-9345-d3bf589d9871/lariledidemivuramukox.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_off00005f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F48 5340 bytes
SHA-256: 1fcf48e9d7867a709bd1ef262994f5f53f69c218771192a27e0c08a70dd3b5d0
font_01_sfnt_off00007193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7193 10772 bytes
SHA-256: 1ec02762aaed1efa2fc800a53486833f4d5d214b2de8c1a94da6f3c21aed0c53

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