Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc8bbd9b60d26d1…

MALICIOUS

PDF

44.3 KB Created: 2020-09-30 02:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78164a9b89f8c2c2d0a07b67d2e4f3c7 SHA-1: d23d504df3dbf914be47827a3ab39d8e265f6426 SHA-256: 0fc8bbd9b60d26d1338baa3e2822b968b23c647421b6d494c88392b78245ba73
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 to `https://gettraff.ru/strik?keyword=alphabet+in+english+worksheet+pdf`. This technique is often used to distribute malware or phish for credentials. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded links points to a SEO poisoning or link farm attack. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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://gettraff.ru/strik?keyword=alphabet+in+english+worksheet+pdf In PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/defosadezebakibati.pdfIn PDF document text
    • https://site-1036834.mozfiles.com/files/1036834/nelititesamenajusuko.pdfIn PDF document text
    • https://site-1036987.mozfiles.com/files/1036987/51704112650.pdfIn PDF document text
    • https://site-1036816.mozfiles.com/files/1036816/fodewukejukus.pdfIn PDF document text
    • http://files.glasgowfad.com/uploads/1/3/1/0/131071117/denusutum.pdfIn PDF document text
    • http://bikof.sokoyaprod.com/uploads/1/3/1/4/131437930/6984486.pdfIn PDF document text
    • http://rijepare.rosplumley.com/uploads/1/3/1/6/131637432/vunebox.pdfIn PDF document text
    • http://files.wauwatosaeastbandboosters.com/uploads/1/3/1/3/131383424/boxis.pdfIn PDF document text
    • http://files.iamc94.com/uploads/1/3/0/9/130970003/rimuvuvu.pdfIn PDF document text
    • https://site-1036862.mozfiles.com/files/1036862/tiwisokekowamijemove.pdfIn PDF document text
    • https://site-1036960.mozfiles.com/files/1036960/61404872097.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0457/8924/9702/files/31834057998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9773/5843/files/23898905106.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/4789/2630/files/barnes_and_noble_interview_questions_and_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/9100/4059/files/14125047111.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9835/6392/files/zubof.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_off00006d79.bin
5451f9fc8dc971c38eaa102e6f12a094685ddedb18e6287974020e8fb207d112		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D79 5588 bytes
font_01_sfnt_off0000808a.bin
170eb2f72d4e5d594d7046fa8f8d1bd146d26851c99fb53e405f043a98cbfe60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x808A 10560 bytes

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