Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bee4f0bcc1ef5ee…

MALICIOUS

PDF

42.4 KB Created: 2020-07-09 14:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 4c1d19509d3c46916217a0f5ac18421f SHA-1: b7b59d81048c402b1c682a46e1d56be1e317ff4c SHA-256: 9bee4f0bcc1ef5eee85eea06e25460ec8cb6274126a255ffb8c65470a29794d6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The document body, though heavily obfuscated, contains keywords like 'school refusal pdf' and the primary malicious URL, suggesting a lure to direct users to potentially harmful content. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating a phishing or redirection attack.

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://ttraff.ru/wb?keyword=school%20refusal%20pdf In PDF document text
    • http://files.biohealthworksinstitute.com/uploads/1/3/1/8/131871994/bujirevisunolo_xabaviza_gimov.pdfIn PDF document text
    • http://files.simplydivinesuds.com/uploads/1/3/1/4/131407812/23f3d849.pdfIn PDF document text
    • http://files.princetonrescue-edu.com/uploads/1/3/1/3/131378918/8802449.pdfIn PDF document text
    • http://files.richmondeducationfoundation.com/uploads/1/3/2/8/132814448/5444816.pdfIn PDF document text
    • http://files.sjtcounseling.com/uploads/1/3/0/8/130814342/robese.pdfIn PDF document text
    • http://files.dvmetalart.com/uploads/1/3/0/9/130969746/xekil.pdfIn PDF document text
    • http://files.match-gems.com/uploads/1/3/0/8/130814161/2009054.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://duvupokupig.files.wordpress.com/2020/06/medipem.pdfIn PDF document text
    • https://jowezeda.files.wordpress.com/2020/07/58557836695.pdfIn PDF document text
    • https://jogapodu.files.wordpress.com/2020/06/40920773850.pdfIn PDF document text
    • https://xusogoresob.files.wordpress.com/2020/06/gavejarezo.pdfIn PDF document text
    • https://tokejar.files.wordpress.com/2020/07/19731973796.pdfIn PDF document text
    • https://sokatuvep109458814.files.wordpress.com/2020/07/6709346798.pdfIn PDF document text
    • https://jozosativotu.files.wordpress.com/2020/06/sunedunasaxo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31056735454.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nifafujejugafux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50878135704.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A13 4992 bytes
SHA-256: b8c10a62caf095f7207dbd27d53df441c087c69370a943084077b2744ad04631
font_01_sfnt_off00007b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B11 10012 bytes
SHA-256: 6251fbe0dd4a0cf823c1b49a2ff3c8ba6e50b1d9d96e22d21c258f2849839f17

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